I voted in the poll, @Igor. Went for red due to the comedy factor, and more importantly, how useful it is with levels like Ice Breaker (as mentioned by @UnseenMind).
In addition to knocking someone back when they're trying to get up out of the water or back onto the playing area in Ichiban, the suckers on the red arrows stop them from being able to climb up effectively in the first place. The effect they have is similar to that of zero stamina when trying to climb. This can buy you a ton of time if you're in the thick of a battle. As has already been pointed out, the other benefit is that they pretty much neuter someone's ability to fight effectively - which is incredibly useful if they've got something like nunchucks or the lollipop.
For me, if I go off the playing area with more than a couple of arrows stuck on me, it's usually game over - especially on Ice Breaker. It's very visible to other players that you're in a bind, and all they need to do is wander over and crack you on the head. Of course, if you've got a good team-mate they'll see also and come to the rescue, but I find that's rarely the case.
PS: First post. Be gentle!
