You say two words, then the next user keeps one of those words, and replaces one with another word...
Here is an example
User 1: Taxi Driver
User 2: Bus Driver
User 3: Bus Ride
User 4: Car Ride
User 5: Car Company
I'll start!
Pizza Finger
Here is an example
User 1: Taxi Driver
User 2: Bus Driver
User 3: Bus Ride
User 4: Car Ride
User 5: Car Company
I'll start!
Pizza Finger