An Appaloosa!
None. Horses are not known to use operating systems nor computers for that matter.
A Khalculator
Barns and no-bulls. (This joke was made up by my 7 year-old cousin.)
RUFFles
Please leaf me alone! Or I'll tell my mom, and you'll get in trouble.
A nun with a javelin through her head
The track is alright.
Pair-a-normal investigators.