One day, I was just chillin', being a tower. I saw a plane, but it was slowly growing.
Then it hit me.
Tower's Realization
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. The joke is that the person is a tower, like a building. They see a plane getting closer and closer. Then, "it hit me" has two meanings: the plane literally hit the tower, and the person suddenly understood what was happening. It's funny 'cause you're picturing a whole building getting blindsided by a plane, and you probably think that is hilarious, you chucklehead.