1 Jamie: Adam, you should rest, after an experience like that.
2 Jamie: Where are you going?!
2 Adam: Just something I have to take care of.
3 {Adam walks over to a sign on the wall which says "Nothing is certain but Death and Taxes"}
4 Adam: {crossing off "Death"} Myth busted!

No, it's not that difficult to write that small. I just use a fine pen.

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2014-12-16 Rerun commentary: That's an interesting back wall I used for this set. It looks like just a simple flat wall made of tall grey bricks. Normally for the Mythbusters I use the more textured bottom side of a baseplate as the back wall. I wonder why I didn't here.

And yes, Adam is writing with a screwdriver. Unfortunately LEGO doesn't make minifig sized pencils.