By Mike Bruno
Updated October 15, 2008 at 06:09 PM EDT

It’s Oct. 15, which means it’s National Grouch Day! Naturally, the first thing that comes to mind is the trash-loving Muppet Oscar (who you may or may not know is just one of many members of the grouch species hailing from Grouchland; see the clip below). But let’s think outside the trash can for a moment and name a few other famous grumps who deserve homage on this day. I’ll go first: Sean Penn, Simon Cowell, and Dick Cheney. Okay, your turn.