It's funny if that happened. Now, you can disagree with me all you want, but I have very good friends who actually work there (

) and they've personally assured me that the effect is
completely automated and random. The only thing that could possibly be controlled is whether the effect is on or off (and the CMs who work that attraction don't have access to that switch: Maintenance does). Besides, the last thing Disney needs is for a wet, angry Guest to demand compensation because a CM deliberately sprayed him with the camel.