Played by David Foley in a "Kids in the Hall" skit:
http://www.kithfan.org/work/transcripts/one/sarcasm.html
You have to see/hear the skit to fully appreciate it.
My point in adding this page:
Use of BrutalSarcasm puts you dangerously close to falling into this category: MicromanagingSadist -- RachelStruthers
There was a similar character on TheMaryWhitehouseExperience? (a UK comedy series of the early '90s), called Ray (first seen on 1992-03-09), who was afflicted with a permanent sarcastic tone of voice. It's an easy joke, but it was actually very funny.