When someone orders a pizza without pineapple.
Pineapple on pizza will totally make you go blind, dude.
People saying "cisgender" and people not paying attention to their driving. Coming in yesterday morning I saw two different cars attempt to occupy an occupied space because they were looking down at their phones. One almost hit a freakin' UPS truck. Had she glanced to her left, that truck would have literally been all she could see. Might be an inconvenience to the UPS driver, but it's a major life-changing event* to those of us on two wheels. And afterward, she pulled in behind the UPS truck and went right back to her phone.
*Or at the least, it's a major pants-changing event.