Running an IM business from a phone.
Also: Always read contracts, today I asked a guy at Sprint how much it would cost to tether my laptop through the phone (with an insane amount of data), he said it's unlimited, 70$ a month. This didn't seem right, so I walked out, I went to a different store and they basically told me that if I needed that much data I would have to do it a different way because it would cost too much. Out of curiosity I asked what the bill would be, they let me know it would be $7570 for the month. Contracts, read them.
EDIT: Internet Marketing Business
"May I have ten thousand marbles, please?"