For me, when you ultimately got your wrist dislocated to the point you can't lean on it ever anymore
Never broke any mouse though, you guys are super APM guys and that's a confirmation I'm very slow on that
Other hint : when you can't sleep because you want to sandbox a new genius trick, then you get out of bed and try it for hours and in the end go @work like a zombie
But then another super "random" freak pops in ,HB_g********* , who can spill out for each second exactly what should be his mass income and stuff. Then you think, "OK i'm not that addicted pheww".