I was going up an ascent when I went to shift from the small ring to the middle ring and the derailler failed to move the chain. Instead, even though it was a full "pull" it just "trimmmed." So i dropped the derailler back down to the small ring and then as I went to shift back up the chain got wedged between the fram and the small ring underneath the bottom bracket. I have no idea how it got there.
How does this happen? (I need to know so i can fix it and make sure it doesn't happen again) It got wedged so badly that it completely bent/twisted the chain link and scratched the heck out of my frame.