Once again, I don't meet specs. ;^)

It's impossible for us (meaning humans) to touch our tongue to the tip of our nose. I have no idea why that came to mind......

sneeze with our eyes open

bengardening beat me to it!

It's also impossible to lick your own elbow, but I doubt that's the answer!

Fold a piece of paper more than 6 times. Or fabric for that matter.

It's impossible for us to do a lot of things!!

Fly like a bird.

Party-music, I know your answer isn't correct because my hubby can do that and it grosses me out, LOL.

Tongue to elbow was my first thought but rob beat me to it.

omg, casey_nfld, I've never known anyone who could. lol! I agree... there are so many things we cannot do....

For example, contrary to what our mothers told us, mothers CANNOT see out the back of their head. LOL!

For men - we cannot always put the seat down.
For women - not saying anything about the seat!

My MIL can do party_musics answer as well. At the risk of insulting casey's DH I'll say no more!

Tickle yourself?

I have heard you can't tickle yourself, but I did, one time. That's a good answer though!

Keep a secret! :)

I'm with bengardening on sneeze with your eyes open.

I agree with sneezing answer. It will be a guess, of all the things humans can't do.

Touch their nose with their chin?

But ... a while ago at an investment conference a guy who wrote a book and also an article in my favourite money management magazine ten years ago, "Stop Working ... here's how you can: I retired at 34" was reporting on his situation, after ten years.

It was on the best-seller list in Canada for a time, as was a couple of others, one titled, "The Idiot Millionaire".

He was an animated guy, and said that an important thing for many of us was to buy stock in a company that provides consumer necessities, e.g. soap and toothpaste ... that how many had brushed their teeth that morning ... and many hands shot up.

When he asked, "And how many didn't?", and only my hand appeared, he wondered why. I reported that all of my teeth had gone on pension/become deceased as of last year.

I should have gone to the front and showed him how a few of us can touch our noses with our chins.

Oh, well ... guess I'd better think of a more creditable answer to the question.
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Multi-task? It's impossible for us to concentrate on two things at once: our mind will think of one, then the other, in quick succession ... but we can think of only one thing at this given split-second.

ole joyfuelled