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The tooltip is an integral part of xkcd.

• turnip1979 13y ago
  ROFL! I did not know this. To be specific if you are not an XKCD reader: hover your mouse over the comic for a second punch line.
  • jthol 13y ago
    Or if you are on mobile m.xkcd.com/<number>
  • lugg 13y ago
    Damn, now you have to start from the start and pick up on all those missed jokes.