Yes, a lighting strike.

The owner was aboard at the time and came rushing out into the cockpit, with eyes like a raped owl. He couldn't string a sentence together for ages - he just mumbled incoherently. Peeps in the pub nearby report that the mast glowed from the heat for quite a while. The stays were blacken with soot like stuff, which washed off after the next rainfall.

The fanbelt is as hard as rock and all the electronics were cooked.