Stop the Bus is a swapping card game: everyone holds three cards, you take turns exchanging one or all of them with the table, and when someone thinks their hand is strong enough they 'stop the bus'. Everyone else gets one last turn, then hands are compared and the weakest loses a life.
The judgement is in when to call it. Stop too early and someone improves past you; wait too long and someone else stops while your hand is still weak.
Depending on the variant, three of the same suit (scored by value) or three of a kind. A single high card almost never survives a comparison.
As soon as your hand is genuinely strong. Waiting to improve gives everyone else another turn to pass you.
Yes — tap cards to swap. Nothing to install.