I can definitely see that working, if instead of a spoke card, it was a banana peel, and instead of real life, it was Super Mario Kart. I don't care though because it's one of those arbitrary rules that still makes sense, like how you have to wear white to play cricket. Also it's funny to watch people sheepishly pull all the flair off their hipstermobiles. At any rate at the burnaby velo there is a hazard that's much more sketchy and fun than either a banana peel or a 3*5 card. There are volleyball courts in the infield---this pays the drome's bills---and the players practice at the same time that they have cycling practice. So, every once in a while a volleyball comes over the netting and bounces on the track. Fun at 45 km/h? Yes.