Just dinged 53 on both my chars. Decided to check out the "grant your friend levels" thing and made a level 1 tauren warrior and summoned it to battlegroundmasters in Orgrimmar.
Started spamming that "Grant a level" button and the screen started flashing.

Level 1-27 in 30 seconds~. Everyone thought that I was using some kind of hacks and started spamming "Hacks!", "Reported", "where can i get hacks?", "are you gm?" etc. *Rofl*