10 Worst Things Hulk Has Ever Done
8. Ruining Bruce Banner's Life
This one is more an amalgamation of events, given that the Hulk has essentially served as both Banner's protector and often his biggest bully.
Now, often this is because the Hulk - at least the primal version we historically have seen most often - is about as smart as a patch of drywall. He reacts only to Bruce's anger and distress, and comes out all guns blazing - which is useful when the issue is "people are trying to kill me", but less useful when B-man is stressing out because of literally anything else, which is a fairly frequent occurrence.
Naturally, this has ruined friendships, relationships, and little things like Banner's ability to go and have a drink without worrying he's going to level like half the city he's in.
Sometimes this bond serves a healthy purpose - for example, in the new Immortal Hulk, the Hulk is very much trying to help Bruce grow and deal with his trauma and emotions - but often the creature existing inside him makes mountains out of so many mole hills.