Plans to cast Jimmy the Jock in the musical video "uptown girl" were scuppered when they gave him some tools, ordered him to "stand in the background and make it look like you know what you are doing".
This unfortunately was the Scotsman's undoing as he hadn't left the office for quite some time and forgot which way to turn the spanner. Thus causing the engine to fall out and onto Billy Joel's foot.
Hence the steel toe cap was born