Giles in “Fear, Itself”

[reading from the book] "The summoning spell for Gachnar can be shut down in one of two ways. Destroying the Mark of Gachnar..."

[Buffy promptly stamps into the floor, destroying the Mark on the floor and tearing up the boards; she looks very self-satisfied]

[greatly irritated] "...is not one of them, and will, in fact, immediately bring forth the fear demon itself!"