{{quote|''"Last version was better," says Floyd. "More bugs. Bugs make game fun."''|''[[Planetfall]]''}}
Some software glitches are so weird and wonderful that everyone likes them and looks back upon them fondly.
There are two common breeding grounds of popular bugs. One is 8-bit and 16-bit consoles where the code, data and game state are stored in one homogeneous block, and a single misplaced pointer can read sound generation code as level data or write the graphic memory to the player inventory. The other is cutting-edge 3D games where half a dozen third-party renderers, physics engines and net codes can conflict with one another in freakish ways.
If a Good Bad Bug is liked ''enough'', it may become an [[Ascended Glitch]]. Subtropes include [[Minus World]] and [[The Missingno]].
If it's related to some game character somehow staying alive, it's [[Dead Character Walking]].
Contrast [[Game Breaker]], as well as [[Game Breaking Bug]]s that may not overlap with the former. They are [[Fake Skill|often helpful to]] [[Speed Run|Speedrunners]]. [[I Thought It Meant|This trope has nothing to do with friendly cockroaches and mosquitoes.]]