A couple of years ago we had a very funny incident while teaching a new kyu 6 how to breakfall from a technique. My partner and I were taking turns taking ukemi from the student as he got the feel for what motions he was expected to perform. After his first few falls with me throwing my partner and I switched places and he provided some instruction based on what he had seen the student do. Sometime during this apparently both became confused as to who was throwing whom and before I could run and grab a camera (I really would have loved to get a shot of this) they basically threw each other and ended up on the mat still holding onto each other with one hand but in a perfectly symmetrical landing with respect to each other. It's one of the funniest things I've ever seen, we're just glad no-one was injured.