Bob-omb

Bob-ombs are enemies that appear in SM64 and SM64DS, they have a counterpart that can open cannons for you in levels called the Bob-omb Buddy.

Behavior
When spotting Mario, they will run up to him and follow him around before exploding. Mario can pick up the Bomb-omb and throw it to make it explode.

Bom-omb
It's unclear why, but some players remember Bob-ombs as a Bom-omb. It might be a case of the Personalization A.I. changing the dialogues or signs in the game, or it might just be misremembering.

Disarming
In some personalized copies, if the player picks up and immediately puts down a Bob-omb, it will be "disarmed." It will then be unable to explode, and instead randomly wander about aimlessly. When a Bob-omb is disarmed for the first time, there is usually a dialogue box explaining the mechanic. However, this anomaly is also rather buggy or incomplete, as several have reported disarmed Bob-ombs still explode upon being thrown or chase the player only to never explode, just being minor nuisances.

Bob-omb Clipping
Bob-omb clipping is a rather well-known glitch in Super Mario 64. Whena player throws a Bob-omb, if they pick it up right before it explodes, the player can clip through some geometry. This is most commonly applied to the Chain Chomp mission in Bob-omb Battlefield. Notably, this glitch is not present in all copies due to the Self-Patching Anomaly.