How To Be Funny If You Are Not?
If most people see you as very serious or boring how can you become a funny person capable of bringing in the right line just at the right time?
"Amid the turmoil and tumult of battle, there may be seeming disorder and yet no real disorder at all; amid confusion and chaos, your array may be without head or tail, yet it will be proof against defeat." -- Sun Tzu, The Art of War
Steve Harvey once said that you need to laugh more or precede the joke with laughter, laugh as you tell it or listen to it.
A joke should contain some truth to make it funny. Then a twist is added after leading your audience down a certain path. A twist will catch them off guard causing them to laugh- some because of what you said but mostly because you (Got) them.
Practice will make you funnier. I say that because what you need to do is learn how to come back with the funny quip, and the only way to do that if it doesn't come naturally is by working at it.