What are some fun acoustic songs to play at a party or something?

I always end up getting drunk and trying to get everyone to sing What I Got with me.
But I need some more sing alongs. Just for S's and G's.
What I Got is the best drunk sing-a-long song ever. Banana Pancakes by Jack Johnson is good for sober sing-a-longs, and Freefalling by Tom Petter is good for being the douch-y "I-steal-your-girlfriend" dude.
Good Riddance(Time of Your Life) - Greenday
Free Fallin' - Tom Petty and the Heartbreakers (I think)
Wanted Dead or Alive - Bon Jovi
'89 MIJ Fender Strat
Rivera S-120
'60s PEPCO Model 211 5w head
'60s Paul (Pepco) 1x12 tube amp
'60s Harmony H303a 1x10 tube amp