And bicycles.

Tin foil hat theory: the oil lobby loves encouraging the use of bicycles for captchas because no matter what, there's always part of the rim of the grainy ass photo just barely sticking into the other square, making you keep locating the fucking bicycles for hours on end, with the hopes that you absolutely hate the sight of them after you've developed PTSD from just trying to visit a stupid website to read something. God damn fucking bicycle captchas.