This is pretty stark contrast to James Altucher's "idea machine" concept. That's where you push yourself to come up with 10 ideas daily in order to build your "idea muscle" concept. Some days he'd come up with 10 ideas for one specific person or business. It seems a bit odd, but the guy did make millions repeatedly (after squandering 100% of his wealth, repeatedly).
At work, our team isn't the biggest bunch of sports fans so our shoot-the-sh1t talk is primarily fantasy start-up ideas.
We bounce the ideas off each other, critique them, laugh. Just in the last week;
I want to create a VR game that's sync'd to your music and you hook up your exercise machine to to move through the game. (inspired by a DIY post here on HN)
My boss has moved on from a device that will shut down every device in the house for family dinner onto some Medical thing he's 'working on' with a colleague.
It's all good fun, creative & social.