An engineer dies and goes to heaven. St Peter says "sorry, your can't come in. You're not on the list, so you have to go to Hell." So the engineer goes to Hell and introduces himself to Satan. After a while of living in Hell, he says to Satan "I can make this place much better if you let me."
"OK" says Satan and the engineer proceeds to install air conditioning and the temperature is soon a pleasant 21 degrees C. Then he installs a PA system so that everybody in Hell can listen to the best tunes.
Up in Heaven, God looks down at what is going on and realises he has made a mistake.
"Let me have that engineer back", he says to Satan.
"No."
"Let me have that engineer back, or I'll sue", says God.
"Oh yeah? And where are you going to find a lawyer?"