Encyclopedia for Parties

Published in 1963, this book is over 50 years old, and I can't tell you how many times I've used it as a resource for games, ideas for themes, and even recipes - for parties.  It's out of date, it's hilariously old-fashioned, it's not even in publication with this jacket any more, and it's still completely awesome.

You can find it - different cover and all - on Amazon here.