Murphy decided that he would like to try skydiving.
So, he booked in with a skydiving club, went through the training course, got all kitted up, went up in the plane and jumped.
After a fantastic free fall, he pulled the rip cord to open his parachute, but nothing happened.
He tried everything, but he still couldn’t get it to open.
As he descended, going faster and faster all the time, another man passed him going upwards
Murphy yelled out, “Hey, do you know anything about parachutes?”
The other man shouted back, “No. You know anything about gas cookers?”
Image used under a Collective Commons License from https://commons.wikimedia.org/wiki/File:2018_freefall_jet_stream_skydive_Marc_Hauser_hanging_jump.png