The drive-by coding anti-pattern
Almost every team does it, but it significantly degrades code health, and does even worse for team culture.
I am not sure why, but out of the set of all anti-patterns, drive-by coding is the one I am personally most disturbed by. Perhaps that's because it's so unnecessary. Perhaps because it's indicative of laziness on behalf of the developer. Perhaps because it is, itself, a smell of much more serious cultural issues. For exactly this last reason, if not for any other, I feel very strongly that this particular anti-pattern should be uprooted mercilessly whenever noticed, before it becomes endemic…
