So 4 of us are climbing a hill on our local ride. I'm riding second, and I'm about 20 seconds behind the first guy. As I approach the top of the hill, he's off his bike, turned sideways off the trail, and looks like he's jerking off, then white stuff goes flying everywhere.
Turns out there had been a bunch of teenagers huffing NO2 from some whipped cream cans, and he found the leftover cans and quickly put them to use.
He then repeated the comedy as the other two riders approached. We now call that place jerkoff hill.