I have a joke for you, what did the north tower say to the south tower? See you later, I've got a plane to catch.
Wait a minute, is this a joke about the tragedy of 9/11?
Yes, I thought it was funny.
I understand jokes and have a sick sense of humor myself, but I feel like you should be careful when joking about a tragedy like 9/11. You could upset people who were family members of victims.
It was just a joke, you shouldn't take things so seriously.
It's not appropriate to joke about the 9/11 terrorist attack. That was an awful day. Think about how you would feel if you lost a family member in that attack and someone made a joke about it.