Here are some nice fun questions I like to ask in a set:
-What is 18cm long and makes every woman happy? a 500€ bill
-Lisa's mother has 5 daughters: Lala, Lele, Lolo, Lulu. What's the name of the 5th daughter?
-Say "white" a couple of times really fast...What does a cow drink? (most of them will say "milk") No it's water!
-Is there a greater number than 1? Is there a greater number than 27? Is there a greater number than 3579? Is there a more naive girl than you? (most of them will say NO!)
-What is this? George Bush has a short one, Arnold Schwarzennegger a long one, Married couples like to use it together, a bachelor has it for himself, Madonna doesn't have one and the pope doesn't use it. (answer: a last name; neg them about thinking sexual all the time
)-Can i perform an intelligence test with you? What color does a blue car have? What color does a red car have? blabla green, yellow,...What was the first question I asked you? (answer: "Can i perform an intelligence test with you?")
those always get a laugh or you can neg them when they fall for it