Thats unreal
Brake cleaner is fun stuff though, Once when my supervisor was ignoring me in the workshop, I sprayed his heals and drew a squiggly line on the ground, moving backwards untill the can was empty (20ft away by now), I then shouted his name, and as he looked on with a puzzled expression,I lit the line of brake cleaner.
Woooosh.........
The look on his face was amazing, he never even moved (well, untill his heels were up on fire anyway)
He even saw the funny side of it after a few hours
Next time he cleans the watch,.......you know what to do