An engineer dies and reports to hell. Pretty soon, the engineer becomes dissatisfied with the level of comfort in hell, and starts designing and building improvements. After a while, they've got air conditioning and flush toilets and escalators, and the engineer is a pretty popular guy.
One day God calls Satan up on the telephone and says with a sneer: "So, how's it going down there in hell?"
Satan replies: "Hey things are going great. We've got air conditioning and flush toilets and escalators, and there's no telling what this engineer is going to come up with next."
God replies: "What??? You've got an engineer? That's a mistake - he should never have gotten down there; send him up here."
Satan says: "No way. I like having an engineer on the staff, and I'm keeping him."
God says: "Send him back up here or I'll sue."
Satan laughs uproariously and answers: "Yeah, right. And just where are you going to get a lawyer?"