Because they couldn't cross the streams.
Collie-wood!
Hare in your milk!
The Bartender says, "For you No charge."
By the time you're finished with the breast and thighs, all you have left is the greasy box to put your bone in.
A. Because they're not supposed to cross the streams
Both stream instantly.
It was important not to fall off the wagon.
Sigourney "Weaver"