Was out riding with a buddy. I was in the lead and missed a turn. I signaled for a u-turn by circling one arm in the air. He assumed (with good reason) that I meant that I would turn into a parking lot or something and go back the other direction. I meant that I would do an (illegal) u-turn in the street. So.....I slowed, started to turn across the lane, and heard him yelling loudly. I hit the brakes and he swerved. His highway peg took out my front fender. Neither on of us went down. But, a fraction of a second later reacting or any of a number of other things could have meant that I'd have hit his leg straight on. Clearly I made a stupid move. And, had he been following a little further back, it could have been avoided. But, our takeaway was that the rider to rider communication was a key contributor to the incident. All is well and we are both riding (and I am waiting for some new tin and chrome.) Hopefully a few lessons learned by each of us!!!