I see this a lot with PLD tanks. The most annoying ones being the ones who repeatedly use it AFTER I've already started casting a cure on them, like they're trying to snipe me with their own self-heals. If you want to hit the floor THAT bad, just let me know and I'll stop healing you.

Oh, and while we're on this sort of topic, I have to mention the ones who think Divine Benison is going to cause the WHM to pull hate like its a Regen. I see tanks sitting around and they won't pull until DB wears off. This aggravates me so much, and you're 100% guaranteed to lose my comm if you do it.