I struggle to imagine that, guys. I think this is almost impossible. I've seen them come in bent in various ways. What we get are artificially produced fish and, hence, a lot of defective ones. No one weeds them out. Farmers send them out by hundreds and thousands, not noticing or looking the other way, then trans-shippers, LFS owners receive them and no one wants to reduce their profit by eliminating the mutants.
A far less likely scenario involves a trauma in the very early age from fighting or predation. It's not an RTC, but from my personal experience, one of my silver aros, beta, threw her back out while fighting for dominance with an alpha when they were ~3". Beta got an S-shaped kink in her back since then and her name has been "Kinky" since then. They are 2' now.
