Some things are only funny in certain situations, so you must be  ready with your humor.  For example, if someone stumbles while walking, it is funny  to say, "First day on your new feet?"  However, it is not funny to say this twenty minutes later, when the stumbling has been forgotten. 
Timing is  the  essence of comedy, so you should always be ready to capitalize on the current situation.  Here are some common situational jokes you can use  the next time the opportunity presents itself.  You should memorize these  and use them as often as possible to show how funny you are.

