We had unexpected company Friday night so I needed to scramble for some snackies for the crew. I always have saltines in the pantry and cheese in the fridge, so cheese and crackers were a no-brainer - but also remembered a summer sausage in the freezer that DH bought for a Christmas treat for himself and we hadn't gotten to yet. Along with a can of peanuts, also left over from the holidays, I was able to throw together a decent snack tray for everyone. Without running to the store and spending money.
I have found, in our set of friends at least, that it doesn't matter WHAT you serve. In the middle of all the beer-drinking, it's enough that you put out SOMETHING for everyone to snack on. I always keep popcorn on hand too, for this very reason.