What are the simple things you cannot do? (e.g. I can't whistle)

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Me? I can't do the following: - I can't drive a car (and I'm 22!!!) - I can't swim (I will learn this eventually) - I can't ride a bike without falling off - I can't play the guitar even though I practiced soooo hard - I can't make poetry that doesn't rhyme (haha) - I can't make anyone laugh at my jokes For me, those are fairly simple things, because out of the 10 best friends that I have I'm the only one who can't do any of those things, all 10 of them are either excellent at all of them or at least fairly skilled. What about you? What simple things can't you do?