At the end of an extremely long day, I laughed out loud at this. That's my excuse. My sister-in-law sent me this, so you can blame her if you groan.

"A mother and her young inquisitive son were flying Southwest Airlines
from Kansas City to Chicago. The son (who had been looking out the
window) turned to his mother and asked, "If dogs have baby dogs and cats
have baby cats, why don't planes have baby planes?"

"The mother (who couldn't think of an answer) told her son to ask the flight
attendant.

"So the boy dutifully asked the flight attendant, "If dogs have baby dogs
and cats have baby cats, why don't planes have baby planes?"

"The flight attendant responded, "Did your mother tell you to ask me that?"
The little boy admitted that she did. "Well, then, tell your mother that
there are no baby planes because Southwest always pulls out on time. Now,
let your mother explain that to you."