There are tons of good Reese's commercials. Here's just a few. An ad set in an opera; a buddy cop spoof; how people eat Reese's; Frankenstein's monster. (I vaguely remember one ad featuring a cop who was dealing with an accident or something, where people got their chocolate and peanut mixed up, but I can't find it.)

A series featuring "circle researcher" Rory Tate.