The World's Hardest Riddle

I turn polar bears white
and I will make you cry.
I make guys have to pee
and girls comb their hair.
I make celebrities look stupid
and normal people look like celebrities.
I turn pancakes brown
and make your champane bubble.
If you sqeeze me, I'll pop.
If you look at me, you'll pop.

Can you guess the riddle?

97 percent of Harvard graduates can not figure this riddle out, but 84 percent of kindergarten students were able to figure this out in 6 minutes or less.