A truck.

As you were walking home, you see an incredibly attractive woman crossing the street, not noticing a runaway semi-truck hurtling towards her. Instead of doing the smart thing and just calling out you run and barrel into her, the truck missing both of you by centimeters. After getting up the woman stares at you before thanking you profusely and handing you wad after wad of bills that when you looked you were shocked to see were 50 dollar bills. "I-I can't possibly accept this much money" you say shocked. "Please, it's the least I can do." After that faithful encounter you are left with 500 bucks. Ding! *Oh great, not again* 'A package containing a transformational pill will arrive at your doorstep and you room mate will mistake it for his medicine!' *Oh no*