I just fell off my trainer because I couldn't clip out of one of the pedals. Owwwe.
Welcome to my world! I have fallen off my trainer twice, and figured I had to be the biggest clutz in the universe. It turns out that there was a defective part on my trainer. All fixed now!
Sorry though, it really does hurt, and more than just your pride...
Don't be afraid that your life will end, be afraid that it will never begin!