My justification for laughing...

I'm still a child!!!

"Children appreciate all that is silly as a matter of course. Their grasp of humor is instinctual, and even the smallest absurdities provoke joyous gales of earnest laughter. As we age, this innate ability to see the value of silliness can diminish.

This unabashed silliness nourished our vitality and creativity. We can take in this nourishment once again by giving ourselves permission to lighten up and be silly.

It is precisely because so much of life is inescapably serious that silliness should be regarded as a priority." DailyOm 9 July 2007

Luckily, I can see the absurdity of almost anything. :)