1. Rock/Paper/Scissors (You're Hired)The first Regular Show episode ever is still my favorite. Partly because of the tie-in to Rock, Paper, Scissors: A Geek Tragedy, and partly because as I mention below, it has an 80's song video sequence.
2. Rap It UpI've seen the Power of Poetry persevere half a dozen times, but I never get tired of it.
3. Carrey O'KeysThe best Regular Show episodes often seem to include a sequence with a musical number from my childhood. The Footloose sequence in this episode is possibly my favorite Regular Show moment of all time.
4. Hangin' ToughThis is that awesome episode that introduces GBF. "Euuuugh! Giant Bearded Face!"
5. Viral VideosMakin' viral videooooooos... oh Wedgie Ninja... we hardly knew ye.
6. Road TripEpisode where they make a pitstop at "Joyspot" aka Funspot in the real world, but also the electro-pop music sequence rocks. :)
7. Exit 9BIt's not even entirely fair to put this on the list, as this season opener featured pretty much every single cool character in the show's history together for an epic battle. EPIC.
8. Roadkill BingoThis was one of the first episodes we saw, but so memorable. Especially the skunk spray battle.
9. Summertime Lovin' In the SummertimeAwesome ode to earworms!
10. Fist-Pump Concert (coffee. Coffee coffee coffee. Coffee?)I was all set to end this list with the Night Owl episode, but then I remembered how one of the things I love most about Regular Show is its constant appreciative nods to coffee. And 80's musical interludes...
I hope this show continues to get the credit and attention it deserves. If there were a Cartoon Network theme park, I would be all over it.