Reddit reviews What If?: Serious Scientific Answers to Absurd Hypothetical Questions, International Edition

Here are the Randall-provided examples:

M0: The Dallas Cowboys running full-tilt into the side of your neighbour's garage.
M-1: A single football player running into a tree in your yard.
M-2: A cat falling off a dresser.
M-3: A cat knocking your cell phone off your nightstand.
M-4: A penny falling off a dog.
M-5: A key press on an IBM model M keyboard.
M-6: A key press on a lightweight keyboard.
M-7: A single feather fluttering to the ground.
M-8: A grain of fine sand falling onto the pile at the bottom of a tiny hourglass.
M-15: A drifting mote of dust coming to rest on a table.

For the accompanying drawings and much more sciencey goodness, buy the book.

But... he did an entire book...

What If? (International edition): Serious Scientific Answers to Absurd Hypothetical Questions