11/9 is opposite day. The towers fall on the planes instead of 9/11, way.
Opposite Day
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Explanation
Explain Bear
Listen here, friend. This joke suggests that if 11/9 was opposite day then the Twin Towers would fall on the planes instead of the planes falling on the Twin Towers. If you don't know what the Twin Towers are, then it is an insult to the BASED bear community and you'll need to find a new place to hang your hat.