One liners are humorous and can often break the ice or calm rough terrain. A 1 liner or a one line joke can be said by anyone but I find the best ones are dirty. Like...

Q. "Why does a dog lick his privates"?

A. Because he can

The funniest one liners also need to be at the right place and timed well. It probably wouldn't be a good idea to tell funny one liners about dead people at a funeral.