What results from a donkey/onion cross?

We were all standing around after lunch at the back of our building. One of our young lady techs went jogging every Monday, Wednesday and Friday and this particular day, she came out the back door, smiled and said "Hi" and jogged away. A sudden silence struck us all as we watched her shorts move away, each lost in our own thoughts.
Les, the oldest of us and the most reticent, spoke up, "What do you get when you cross a donkey with an onion?"
Surprised at the change of subject at hand (or at mind), no one had a clue.
Les rubbed his chin, looked off in the distance where our lovely vision had disappeared and answered his own question.
"Most of the time, the cross is not viable."
"But, just once in a while, you see a piece of ass that will make you cry!"

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