You're probably getting tired of these gravity jokes... but I keep falling for them every time.
Falling For Gravity
Categories
Explanation
Experiment
The joke plays on the double meaning of "falling" for a joke, which means to be tricked or amused by it, and "falling" in the literal sense due to gravity. The speaker is acknowledging that they know the joke is corny, but they still find themselves enjoying it. It's self-deprecating and a little bit meta.