When a striker slides in on a keeper studs showing, misses the ball and clatters the keeper, I hate it when a commentator says, "he had every right to go for it" or whatever. Of course he did, but if he misses it, he should be booked/sent-off as he would if it was in central-midfield.
Similarly, a keeper being allowed to come for the ball from a cross with a knee in the air pretty much head height, and not being classed as dangerous play.