Because they are black and white.
or
She was a Roman (roamin) Catholic
or
"Pint please, and one for the road."
or
On the latest episode of "Celebrity Apprentice", Donald Trump fired himself!
or
2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
By paying them to cheer for him during campaign events.
or