In my current company, ping pong table is the strongest day-by-day teambuilding activity — something that different team members do together, not related to work, something that builds positive relationships between anyone. Most of interactions with some people in the company are intense and have potential for conflict (just because our respective roles), and ping pong offers us a chance to have a different kind of interaction.

In previous company, it was a pool table and game room with Rocket League. In one before that, foosball. Regardless of the game, having some game that is played regularly by coworkers together really helps to build positive relationships and create a team. Definitely worth investor's money.