Probably streaming and replaying youtube videos, or something similar. Not that hard to run through several gb in a few hours. Multiply by 30 (days&#x2F;month) and you can see 60 gb a month being easily doable.<p>Torrenting games and 1080p movies is even worse - at 10-60 gb a pop, the time to hit a 300 gb cap is limited only by your download speed.