I know him from 1600 Penn; and Wish I Was Here; and a few eps of New Girl; and Pixels; and Beauty and the Beast; and as the voice of Olaf in Frozen.
I know him from Roseanne; and I Know What You Did Last Summer; and a few eps of My Boys; and The Big Bang Theory; and a small role in In Time.
I know him from Titanic; and Legally Blonde; and Tuck Everlasting; and I must have seen at least one ep of Alias (I hope to see the whole series someday); and he was in several eps of The Flash; and several eps of The Orville; and Happiest Season. Also he voiced Sinestro in Green Lantern: First Flight; and Master Thundering Rhino in Kung Fu Panda 2; and his Flash character, Martin Stein, in Vixen. And undoubtedly I've seen him in other things that I've forgotten.
I know him from The Rockford Files (I must have seen at least one TV movie based on the series); and Maverick (the movie, not the series); and The Notebook; and The Ultimate Gift. Also voice work in God, the Devil and Bob; and Battle for Terra; and Atlantis: The Lost Empire.
I know him from Everybody Loves Raymond; and The Crazy Ones; and Single Parents; and some voice work. Also a 2016 Christmas ad from Apple.
I know him from Ned & Stacey; and Ally McBeal; and The Sandlot 2; and the pilot episode of Eureka; and season 5.5 of Once Upon a Time; and a very small role in So I Married an Axe Murderer; and an ep of Brooklyn Nine-Nine; and voice work in Bolt.
I know him from Big Fat Liar; and The Truman Show; and Sideways; and Lady in the Water; and a minor role in The Amazing Spider-Man 2; and Saving Mr. Banks. And probably some other stuff that I don't really remember. Also some voice work.
I know him from The 'burbs; and Switching Channels; and a minor, non-speaking appearance in Gremlins 2; and a recurring role on Boston Legal; and Luck of the Irish; and Wedding Crashers; and various voice work; and probably lots of things I've forgotten. Also I always thought it'd be cool to see Rowan & Martin's Laugh-In, but I never really have....
I mostly know him from Firefly and Serenity; though I also enjoyed his work on Teen Angel, I guess. And there was a minor role in a couple eps of Agents of SHIELD. I reckon I should see some more of his work. And it'd be nice to find more links for him, too.
I know him from Community; and a cameo in The Muppets; and a minor but cool role in Spider-Man: Homecoming. Also he has a music career under the name "Childish Gambino," and I must have seen one or two of his videos.
I know him from Scrooged; and Gremlins 2; and a minor role in Batman & Robin; and Brimstone; and Smallville; and an episode of Evil; and he voiced the Riddler in Batman: The Animated Series. And doubtless I've seen him other things that I've forgotten.
I know him from Double Rush; and Head Cases; and a few eps of Friends; and The Unusuals; and A Beautiful Mind; and an ep of Lore. And he voiced Raoul in A Monster in Paris (though I didn't recognize his voice).
I know him from Buckaroo Banzai; and an episode of The Ray Bradbury Theater; and Fay Grim; and Independence Day; and Jurassic Park; and Transylvania 6-5000; and The Grand Budapest Hotel; and Thor: Ragnarok; and an episode of Storytime with... and probably some other stuff. He voiced Aaron in The Prince of Egypt.
Of course I know him first and foremost from Roseanne. But there was also Sea of Love; and The Big Easy; and Matinee; and The Flintstones; and The Borrowers; and The Big Lebowski; several eps of Saturday Night Live; a couple eps of Now and Again; and O Brother Where Art Thou?; a couple eps of Studio 60 on the Sunset Strip; Speed Racer; several eps of Community; and also some voice work.
The first thing I recall seeing him in was 3rd Rock From the Sun. There's also 10 Things I Hate About You; and (500) Days of Summer; and Inception; and The Dark Knight Rises; and Looper. Also he voiced Jim Hawkins in Treasure Planet.
I know him from Saved by the Bell; and Commander in Chief; and an episode of Don't Trust the B---- in Apt. 23; and Pitch; and Mixed-ish. I also watched a few episodes of The Passage.
Best known from Cheers and its spin-off Frasier, of course. Also there was one episode of Star Trek: The Next Generation; and X-Men: The Last Stand; and Down Periscope; and Benedict Arnold: A Question of Honor; and Mr. St. Nick; and A Christmas Carol: The Musical; and an ep of Modern Family; and Proven Innocent. And some voice work.
I know him from Four Weddings and a Funeral; and The Englishman Who Went Up a Hill But Came Down a Mountain; and Doctor Who: The Curse of the Fatal Death; and Bridget Jones's Diary (and its sequel); and voice work in The Pirates! In an Adventure with Scientists!
I know him from a recurring role on Northern Exposure; and The Red Green Show; and Defiance; and the "Mystery!" installments A Thief of Time and Coyote Waits; and the short-lived series Wolf Lake; and an episode of Read All About It; and a minor role in Twilight: New Moon; and Maverick. And... I'm sure I've seen him in tons of other things I can't recall right now.
I know him from Real Genius; and The Pretender; and a minor role in The Monster Squad; and Napoleon Dynamite; and a few eps of Lost; and an episode of Supernatural; and an ep of Psych.
I mainly know him from Due South (and a couple of songs he sang on that series, "Robert MacKenzie" and "Ride Forever" were pretty good). I also know him from The Red Green Show; and Eastwick.
I know him from Benson; and Sports Night; and Big Fish. And of course he voiced Rafiki in The Lion King.
I loved him on Gilmore Girls. There were also a few eps of Andy Richter Controls the Universe; and The Specials; and a small role in Guardians of the Galaxy (and a bigger role in Vol. 2); and maybe some other stuff.