That's a tough one, as adults are harder to please than kids for a party...but in the "games" field, you could play a few rounds of R.A.T.S. (Just like S.P.O.O.N.S. but use rubber rats in a circle in the middle of the table with their tails facing out) We had a lot of games planned for our adult Halloween party last year, but we all voted to just continue playing R.A.T.S. because it was the most fun, and all can play without having to concentrate too hard...Sort of infantile, but fun! (but you'd have to buy some rubber rats)