While playing on mond-wow i found a haste bug.
the bug only happens when you have haste trinkets from the cataclysm raids.
after having the haste trinkets go to supernatural instance and choose old and then choose betrayal or sergas instance.
after being there you will be fighting creatures who use cripple.
with the cripple being put on you you can continue fighting and watch your attack speed decrease down drastically.