Im quite bad when it comes to someone cutting me up or tailgaiting or even going too bloody slow... I can't stay calm when someone is just been damn right rude and ignorant.
If they nearly wipe me out... I chase them. (and make hand gestures alot)
If they are going to slow in the fast lane and the slow lane is moving far to fast I will undertake. (and make hand gestures)
If they tailgate me and Im in the way i move over but if they are flashing their lights for me to get out of the way when im actually passing other cars then they are pricks so I slow down hehe just to annoy them that lil bit more then I let them pass and go for the chase lol and start flashing at them.. I wont however do this if theres aload of other cars about.. just on straight stretches of large roads.