None. Horses are not known to use operating systems nor computers for that matter.
You never know if your gums are bruised.
Your homework is done and your computer is upgraded, but two hours later he is still trying to back out of your driveway.
A1: You need a quarter to use the phone.
He used cowculus!
The horses would drown. Ba-dum TISH
A Nightmare
C: PU!
The Netcracker suite.
It doesn't matter, they all turn them the the wrong way.
Because black boards matter.
Arapahoe.
This is the kind of stuff that makes my head hurt.
The operating system
Unix