#2557: Immunity
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Transcript
[White Hat has raised his hand, palm up, as he addresses Cueball.]
White Hat: See, it's good to get infected, because it gives you immunity.
[White Hat has lowered his arm.]
Cueball: Why would I want immunity?
[Same setting.]
White Hat: To protect you from getting inf...
White Hat: ...wait.
(Sourced from explainxkcd.com)
Title text:This plan may sound appealing to people who know a little about the immune system, but the drawbacks are clear to people who know a lot about the immune system and also to people who don't know anything about it.