Once I was merging across/filtering between lanes in a very busy interchange (interstate cloverleaf entrances/exits) to turn left at the next light, and some idiot teenager rode up next to me and just screamed out the window, no words, just HAH!!!! Scared the bejeebers out of me. I felt like riding up to him as he was trapped at the red light, leaning my bike against his door and punching him in the face before he could roll up his window. But I didn't.