This couple goes to an agricultural show way out in the countryside a fine Sunday afternoon, and are watching the auctioning off of bulls.
The guy selling the bulls announces the first bull to be auctioned off:

"A fine specimen, this bull reproduced 60 times last year."
The wife nudges her husband in the ribs, and comments,
"See! That was more than 5 times a month!"

The second bull is to be sold: "Another fine specimen, this wonder reproduced 120 times last year."

Again the wife bugs her husband, "Hey, that's some 10 times a month.
What do YOU say to that?!"

Her husband is getting really annoyed with this comparison.

The third bull is up for sale: "And this extraordinary specimen reproduced 360 times last year!"
The wife slaps her husband on the arm and yells,
"That's once a day, every day of the year! How about YOU?!"

The husband was pretty irritated by now, and yells back, "Sure, once a day!
But ask the announcer if they were all with the same fat cow!!"