Short clips that say a single first name have become a staple of online soundboards because they are easy to reuse in any edit. Bob fits that pattern: the name is common, instantly understood and short enough to drop into a reaction or a prank without interrupting the flow. Creators use it when a Bob appears in a game, a show or a clip, or when they want a deadpan callout. Its staying power comes from that flexibility rather than from one famous scene, since the same word works in comedy, gaming and reaction videos.