I've never seen anyone get hurt from a non-moving tip-over while being clipped in, but it is friggen hilarious!!! I've fallen twice: once a dog ran right in front of me unexpectedly and I quickly stopped and pulled my foot UP (duh). The other time I tried unclipping only one foot and accidentally leaned the other way. Both hilarious.
Wife just did her first 25 miler last weekend and fell as we stopped at the truck after the ride - HILARIOUS!!!
There is nothing better than watching someone panic right before falling while clipped in and stopped - as long as they're not hurt and don't ruin their bike.