Game developers know the pain! The guy is happily riding his bike with a stick, then suddenly the stick passes through his body like a ghost because—surprise—no collision detection! In Unity and other game engines, forgetting to add a capsule collider is basically inviting physics to take a vacation. That stick should've bonked him on the head, but instead, it's phasing through him like it's quantum tunneling. Every game dev has had that moment of "why isn't this object interacting with anything?!" only to realize they forgot the most basic component.