I like oxymorons....I thought I'd start this up...just for laughs!
I will get us started with a few.
Microsoft Works
Military Intelligence
Jumbo Shrimp
Expect the unexpected ....
Fat free ice cream...
Nondairy creamer
act naturally
almost certain
constant change
little giant
tragic comedy
uninvited guest
calm wind
soft rock
sweet and sour
sound of silence
Cold Sweat
unbiased opinion
truth-in-advertising
Zubaz Spelling (correctly)
clearly confusing
power ballad
hot water heater