1 Jamie: Here's the plan. You set off every explosive that ever existed or will exist here.
2 Jamie: I'll go back to the beginning of time and set off every explosive that ever existed or will exist there.
3 Jamie: And we'll see if one or the other - or both - create the universe.
4 Jamie: What are you thinking?
4 Adam: Is there any way we can make this more spectacular?

Of course with a time machine, they can both have copies of the same explosives at each time.

Actually, that's a way to make it more spectacular. Have multiple copies of all the explosives ever at each time.

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2022-01-16 Rerun commentary: People often ask what caused the Big Bang.

Here's one example of what could cause it.

Actually it wouldn't be all that surprising to find out that our universe was the product of some prior universe's being's idea of a cool thing to try just to see what happens.