Many funny, quick jokes include both question and answer, such as, "Have you heard about the new restaurant named Karma? There’s no menu, but you get what you deserve." Another example is, "Have you heard about the mathematician who’s scared of negative numbers? He'll stop at nothing to avoid them."
Some quick jokes seem like observations about life, such as, "I never believed my Dad was stealing from his job as a road worker. However, at home, all the signs were there." A joke in that same vein is, "I went to the bank yesterday and asked the banker to check my balance, so she pushed me!" Another example is, "What’s the best thing about Switzerland? I'm not sure, but the flag is a big plus."
Another category of quick jokes involves wordplay, including, "When you get cold, stand in the corner of a room for a while. They're usually around 90 degrees." Another example is, "A man walked into a bar with jumper cables draped around his neck. The bartender said he could stay, but he couldn't try to start anything."
A funny joke that is finished in just six words is, "I invented a new word! Plagiarism!" A shorter joke is, "I can't stomach tripe." Shorter still is the statement, "Death is hereditary."