Not a good idea.
Stihl specifically addresses this in their manuals for the cut off saws. A fireman or two have been decapitated when they thought it would be a good idea to throw a saw blade on and cut into the side of a house, saw kicks back and goes all muslim on them.
Never use circular saw
blades, carbide tipped
blades, rescue blades,
wood-cutting blades or
toothed blades of any
nature. They can cause
severe personal injury
from blade contact,
thrown objects and/or
reactive forces, including
kickback. See section