We've always thought catwalk modeling was as easy as being really tall and skinny and able to put one foot in front of the other. But it turns out that is not so easy.

The very heels that further elongate the girls can cause all sorts of problems mid-strut, as can slippery surfaces and even hidden trap doors!

Ouch. Zero body fat might score you a contract with Calvin Klein, but it's always nice to have some padding when you take a tumble. Our favorite spill came at about the :37 second mark. The young lady in the red micro mini gallantly tries to balance herself as both of her ridiculously high heels start to give out. She almost does it then ... splat.

Who says models are only fun to look at? They're pretty funny, too.