Picture frames, mattresses, a door, other household debris—oh look, a discarded flowerpot—litter the front yard of a Greenville, N.C., mansion one March afternoon. Inside, jelly and barbecue sauce are splashed all over the rug. One of the back windows is cracked. Eleven college-age men are living here, participating in a challenge hosted by MrBeast, real name Jimmy Donaldson.  Donaldson , who turns 28 in May, is the most popular You­Tuber on the planet, with over 650 million subscribers across his channels. His games often involve contestants, or Beast himself, trapped in weird places for long periods of time competing for cash payouts of up to eight figures. These guys had all crowed on social media that Donaldson’s contests are far too easy. So he stuck them in this house, and incentivized them to make each other’s lives a living hell.  Thus, the mustard tossed across the kitchen. Cameras observe the men 24/7. It’s day eight of the competition, and four people have already exited the premises.…