When your brother’s funky deformed cactus falls off the window ledge, just let it fall. Do not reach for it.
Do not attempt to catch it with your bare hands.
What kind of idiot would do that?
Also, I should point out, that the same advice holds true for all cacti. Unless you are doing some weird fraternity hazing, there is no reason to ever try to catch a falling cactus. And for sure, do not put it in your pocket. Why would you even need a cactus on a rainy day?