Sleep deprivation is a funny thing. Sure, you get tired, but the lack of sleep eventually messes with your mind. All of a sudden, light bulbs seem funny, your mouse pad is mocking you, and bottled water is the best thing in the entire world.
Chain-tanking random heroics for hours on end, rather than work on my 30+ page biology portfolio, became my sole ambition. You know it's getting bad when you look at Recount, see that you are destroying all of the DPS, and keep going. I mean, I'm an easygoing guy... to a point. There is just no excuse to be doing that terribly.
(Hunters with your taunt on, I'm staring intently into your soul here.)
Sure, you don't have to be in T10 right out of the gate, but don't show up to heroic Halls of Reflection with BoA gear and quest greens. That's a slap in the face to everyone else, ESPECIALLY the healer.
And when you upset the healer, you upset me, because, as a tank, if there is one person that I WILL taunt off of, it's the heals. So go ahead, piss off the guy healing your wounds, see what happens.
... What's going to happen, you ask? You'll get an angry tankadin runnin' your ass down like Dugan trampling that ref during the Vikings/Steelers game:
Healer friends, I'll be the Dugan to your Harvin, this I promise you.