Yes I agree running in front of a toon throwing pies unannouced is rude TBH. If toonup is needed then press and hold jump key(move away from VP main attack area as getting hit while being tooned up is an irratation too), and use mouse to select speedchat phrase for toonup. There is always someone who will oblige, and if toons are too mean to oblige you and you are getting near danger territory in laffs, then sit back jumping and preserve yourself till end, if they don't help you, then you don't help them.
Also tooning a stunning toon is not good idea either, as they may be lowish in laffs, but unless they ask they probably don't want, and your splats are just blocking their view of stun, and everybody can suffer that way if stuns stop for too long.
'Keep it Kool
'