#2487: Danger Mnemonic

XKCD comic, described below.
Transcript

[Miss Lenhart is holding a finger up in front of two children: a boy with spiky hair and Jill.]

Miss Lenhart: Now, remember:

Miss Lenhart: If red touches yellow amid leaves of three under a red sky at morning,

Miss Lenhart: You should probably just get out of there.


(Sourced from explainxkcd.com)

It's definitely not the time to try drinking beer before liquor.

ExplainOriginal