Roxy did many times the first year that I got her. The vet thinks it is because she was couped up through her whole puppyhood so her motor skills didn't get developed.

She did things like misjudge the distance of the trampoline...She'd start her jump onto it like 12 feet away and totally miss it.

Or she'd run into posts, fall down, and then she was like a deer on ice trying to get back up.

Really it was more sad and pathetic though.

But Sarah, she's embarrassed herself a few times and it's funny as heck! When the sliding glass door is clean, she gets so excited about running away that she runs smack into it. Then she gets embarrassed that her escape attempt didn't work.