I was thinking, if there is a big bang that spurted out all matter in the universe, wouldn't there need to be a big detonator. In this world, every explosion has a trigger that caused it to happen. Those linear plunger ones that you push down comes to mind. You push the plunger down and it generates an electric charge, the charge runs across the explosive material and causes a chain reaction that leads to an explosion.
Then I was thinking of a scenario where you're wearing roller skates and you have a dog on a leash pulling you along. Is that a vehicle? How would you define the vehicle? Dog and Skates?
Then I was thinking what would happen if you kept zooming into an atom, you would see the quarks and other sub atomic particles that make it but then what? What are the sub atomic particles made of and all the smaller particles that make up those.