One I can't stand -- offense is driving in for a lay-up, a defender slides underneath, defender and driver make contact, defender falls, offensive guy makes lay-up (and probably falls too) -- and there's no call.... IT'S GOTTA BE SOMETHING!!! Either a block or a charge. Can't just be a no-call. That one drives me insane.
Second rule that bugs me -- offensive player's driving, defensive player is parallel defending, and offensive player comes crashing into the defender to create contact and get a lay-up attempt, and gets the foul call! I personally believe no matter what the defender does in this situation it should be a no-call! Offensive players are gifted way too much contact and allowed to barrel in out of control. It's a bail-out call.
Last, if you are a post defender, and you have your hands straight up in the air, and some offensive player comes charging in and delivers a blow to your chest - it's just friggin physics that your hands are going to come down. Should not be a foul.