You could also just wish that their bike gets crushed and that they loose their licence. Or maybe that they get an itch they just can't quite reach.
The motorcycling community has this stupid mantra "loud pipes save lives." There's only one problem: it isn't true. There is no compelling evidence backing up that claim. They then use it as an excuse to get the most obnoxiously loud pipes they can - often illegally modifying them to remove baffles so they can be even louder! I have no idea why this isn't being policed as it's easy to do.
Their bikes are so damned loud I can't even ride alongside of them. The one thing that gives me a smile is I know in 20-30 years they are going to have one helluva case of tinnitus. Yeah, payback really is a bitch!