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Okay so this is a late response but...I used to say the same thing....

Stand with your back touching the wall and the back of both heels touching 
the wall. Without bending your knees, bend forward at the waist and touch 
your toes without falling over. Can't be done.

...but it actually *can* be done.  I've seen it done...there are two 
ways/reasons it can be done:

#1:  Some places have a base border - on rare occasion they are thick 
borders - effectively allowing people to push their butts to the wall!
#2:  Someone could fold over incredibly quickly and compress her/himself 
darn flat.  I used to tell my class that anyone who could do it would get 
$5.  *That* gave them plenty of impetus to try... and eventually two people 
succeeded.  One was a gymnast-type who crawled down the side of her body 
then quickly compressed flat.  The other one went flat quickly as ell but 
then, grabbed a little handhold on the base of the wall giving himself 
enough added force to counteract the little amount of weight that was over 
his toes.  Students can keep you honest...but they still understood the 
idea...and over 99% of the time you'll be right about people not being able 
to do it.

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