Yeah, there have been a few instances where I've been grouped with a threesome that has "that guy." Just the other day, was grouped with a random threesome, and I started off par, par, birdie. Sure enough, on the 4th tee box, my usual miss returned and I hit that big high fade (more like a mini-slice). The guy wearing his matching adidas+Taylormade outift, who had started off double, double, pick-up, piped up and told me I had dropped my knee. I'm not even sure what that means, but I simply acknowledged him, made a few practice swings (trying to look like I had picked my knee back up) and kept playing. Eventually he got so frustrated with his own poor play, and distracted with his cell phone, that he kept quiet. I just try to be nice about their attempt to help me and let it go. I typically know what I did wrong when I make a bad swing, and if their observation is consistent with one of my faults, I'll keep it in mind. But I refuse to let "that guy" ruin my round.