I'm gonna be the obligatory bastard that says they can undo a bra in two seconds flat, one handed, in the dark.
But it's ok, because I really can.
Work out which side is the hook, put first finger on the other side, press lightly to hold it in place, pinch the rest of the tab, pull towards first finger, pull away from body, and it's off. Dunno if this is true for other countries, but the way the hook/eyes are around in Australia makes this far easier left handed than right. (Assuming you reach around to do a rear clasp. Never tried a front one.)
Why is it that 4chan is either infinitely awesome, infinitely bad, or "lolwut", but never any intermediary level?