Humour!

Hmmm...let's see...we've been through love, hope, depression and useless junk...

Time for Humour, then!

Two atoms walk into a bar, the first one says "I seem to have lost an electron".
"Are you sure?" says the other one. "Yes, I'm positive"

See, there are a few essentials when telling a joke, that really decide whether it will be well recieved or not.

First of all, you mustn't laugh!
One of the biggest mistakes that stand-up comedians make is laughing at their own jokes, thereby implying a considerable lack of self-distance and ability to understand that what they just said was amusing.
Standing there, on a stage, and snickering at your own jokes makes you look like a tosser, and that goes for any type of humour!
Being able to say odd things with a straight face can transform a rather dull statement into a great big celebration of funniness!

Second, go for the easy points!
People are stupid, so it is highly likely that if you go for the cheap laughs they will somehow believe that you are being ironic and "making a point".

Third, aim for situational comedy...in real life!
As previously stated, people are dumber than mud, thus they will not realize that the funny things you do are intentional.
So, when your teacher has spent half an hour explaining to the entire choir how you are supposed to go completely silent for a few beats of a song, when you rehearse it you SHOULD be the one who pretends like you forgot all that and make a slight sound at that particular moment in the song, thus making it necessary to go through the whole thing again!

Now THAT is humour!

Oh, and use accents, everything is funnier with an accent!
Try reciting the "You shall not pass!" line from FoTR in an indian accent, people WILL laugh!