One time I was playing a guy and my game ball was stuck in my hole and i had one one or two balls above the head string on my side so it would do no good to follow the ball in... the guy shoots at the ball in my hole and intentionally double hits the cue ball, pocketing my ball. he then looks at me with this goofy smile and says "oops, thats a foul", spots up that ball and one from his hole, now i am shooting from the end rail... scumbag... another one i have seen a few times is where someone will have the cue ball stuck in one of the corner pockets and just drive the cueball into the titty and hold it there with there stick calling an intentional foul however when you step to the table the cueball is so far corner hooked you can't do anything... these are just the two i have had the pleasure of experiencing... anyone else got some to add that i can watch out for?