Please be careful and make sure no cops are around when you do this to a downed rider. I was riding and a couple jackasses were doing this about 5-10 feet from their buddies heads. I went over to talk to one of them and his buddy sprayed us while we were talking, haha, asswipe. Nothing wrong with sprayin someone, but getting close enough to take someone's head off isn't a good idea.
My best spray ever was on a house boat trip at Lake Shasta. We had 3 houseboats tied together and about 60 people were on the rear decks gathered around the kegs. A guy rode up with a 550 asking for a beer, I gave him a beer in exchange for a ride. I did a few tricks then rode up close and did a fountain towards the rear decks. I drenched everyone, turning the bars side to side and nailing everyone. I didn't expect it to work so good. I thought everyone would be pissed, but everyone cheered and just got more beers.