Because they're extinct
Sentimental attachment. -It just caught fire. -Aww, just like old times.
There are so many Wings and Wongs, you might wing a wong number.
Want to hear a clean joke? Bob took a bath. With Bubbles. Want to hear a dirty joke? (Punchline hidden so you don't accidentally read)
Because a sheep can hear a zipper go down a mile away.
Because their entire species is extinct.
Because the pee is silent.
A comic relief.
Depends.