Sweet Caroline
Don't Stop Believing - Journey (I drop this down so I can sing it
)
Blister in the Sun - Violent Femmes
You never even call me by my name - David Allen Coe
Wanted Dead or Alive - Bon Jovi (or any 80's power ballad for that matter, a lot of people love 80's hair band stuff.)
This are all great sing along songs, even when the crowd is slow and talking among themselves I can always get a bunch of them to sing along with these. I have most of these with lyrics and chords in a word file if you have need.