Me too. Sometimes it comes back to bite you:
Example #1: I volunteered to be Ralph Severe's uke at a seminar in PA. He proceeded to put me in a choke with a hanbo and throw me by my neck.
Example #2: On a Japan trip, Hatsumi sensei had used everyone in my group but me as uke, so it became a running joke with us that he was "ducking me." On our last day there, we were training at Ayase. Hatsumi sensei showed a technique and told us to "go play." I turned to my partner and said, "Yep, he's still ducking me." My partner gets this huge grin on his face and says, "Here he comes." I turn around and Hatsumi sensei walks up to me and gestures for me to grap his lapel. I do so, and he attacks the side of one of my fingers with his thumbnail. It hurt so bad I couldn't even yell, and instantly went to my knees. The whole group got a good laugh out of that one.