#3004: Wells
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[Megan is on the left hand side and is facing Cueball who is on the right side and facing her. Megan has her left hand raised.]
Megan: I need water, so I think I'll dig a deep hole and drink whatever liquid I find at the bottom.
Cueball: What will you do after you drink it all? Dig another hole?
Megan: I dunno. Hopefully it magically refills itself or something.
[Caption below the panel:]
It's ridiculous that wells work.
(Sourced from explainxkcd.com)
Title text:You do have to be careful, though--sometimes, instead of water, you hit this free fuel that you can sell for a lot of money instead.