[cafard]

I'm not sure whether I would consider spraying the same thing as leaking. (Yes, I went to an all boys high school, and yes I'm familiar with the trick.)

I hope that in the salesman's place I'd have had the calm to say, "What that really necessary?" and let it go at that. On the one hand, the splatter pattern does not suggest a leak, and he could explain what happened and get points for being cool about it. On the other hand, if there is one high school boy (by calendar or by mental age) who doesn't know the trick, then somebody else could get splattered.