Monday's Joke

It might be a nice series to start: a joke for every Monday. What do you think? My sense of humor is slightly sick. This is a joke I like a lot, but nobody ever laughs when I tell it:

Two fishes were swimming in an aquarium. They suddenly hit the wall. One turned to the other and said: "Dam!"

Or how about this one:

Two cows were munching on some hay. One of them turned to the other and said: "Isn't it awful about the mad cow disease?"

"Yes," answered the other cow, munching away. "I sure am glad I am a squirrel."

I'm sure you can do better. There are lots of good political jokes, too, but I don't feel like mentioning certain names again today.