Two skydivers, Harold and Lester, jumped out of the plane and were having a conversation on the way down.

Lester: "I was in a hurry this morning, and I can't remember if I asked you to pack my chute for me."
Harold: "I've been pretty forgetful myself. I'm lucky I remembered to pack mine."

Lester: "Wait a minute. You mean I forget to ask you to pack my chute for me?"
Harold: "No, silly. You didn't forget to ask me to pack your chute. I'm the one who actually forgot to pack your chute!"

Lester: "Phew! Thank goodness, for a minute there I thought I was losing my mind!"