The potion drop bug (I don't consider it a hack) is ****ing hilarious to use in cow lvls. Just get near a group of people partway through the cow lvl and use it (Open tp, throw potion to very edge of screen, and enter tp before it hits ground) and watch 3-5 people get slaughtered, followed by each of them "dropped due to timeout".
And then those who know it was you claim they will report you to blizz... bwahahaha
And even though it doesn't drop people with mh, a LOT less people are using it now since the whole mass account deletion by blizz.