Why do cats like olives?

Update: My daughters fixed,female cat goes crazy for olives and rolls around on the floor with the pit! I thought maybe it was because it had similar smell to catnip ,but this cat won't go near catnip!! Another idea was the maybe the musky smell of the olive is similar to the natural scents of another cat. Any ideas?
Update 2: Ok let me elaborate further....the olives/olives pits excite her as catnip excites most cats.
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