Lesson for Today: The Exponential Difficulty Theorem
1) It is hard to cut cardboard
2) It is very hard to cut double-walled cardboard
3) It is very very hard to cut wet cardboard
So thus, unfortunately, it follows that:
4) Cutting wet, double-walled cardboard is impossible without a chainsaw or, if you live in an anime, a kendo blade (see the Law of Xylolaceration for details)