What could possibly go wrong?

[motto (RIP)]

I saw an amusing incident at the Bendigo swap meet a couple of years ago. I happened to be walking past a site where the seller had all sorts of gear spread out on the ground including a small single cylinder engine like a Briggs and Stratton. There was a fellow sitting on his heels looking at the engine and as I watched he grasped the crankshaft pulley and slowly rotated it. The peaceful scene was abruptly changed with a loud BOOF and an eruption of smoke so unexpected that everyone was momentarily stunned.
I don't know if he bought the engine. He should have done because it obviously wanted to go.
Spark and fuel, be very wary.
David