If anyone ever says to you “Guess what?”
Respond with : “You have a penis?”
Since that isnt the answer they were looking for, some will instantly say “no” then you say “so you DONT have a penis? im glad we sorted that out” but if they are quick witted and say “Yes” then you can say “ahh i figured it out” and promptly walk away from them, leaving them without find out what they wanted to tell you.
…of course if they are a chick dont answer “you have a penis?” make it something like “your a woman?” and follow through…