None. Horses are not known to use operating systems nor computers for that matter.
They know their knots.
You've had whey too much!
Because they can't take it seriousry.
Purrgatory.
Nine. One to do the shoeing, and eight to lift up the horse!
Everest. Any time he is bored I see him Mount Everest.
Because they let IT go
A: He wanted to feed the mouse.
Nevermind, it doesn't really matter.
It doesn't matter
An obliga-tree.
Black Red or Iced Iced Ink Well yes you do but I didn't want to mention it.
The operating system
Unix