I met a cat, one night at my dad's condo complex, while making a trip to my car. He was very friendly, running right up to me and meowing, even rubbing against my leg.
I talked with him and petted him and we were getting along great. I got what I needed from my car and began my walk back to my father's condo, with the cat following closely behind me.
He continued to run and brush against my legs until I reached the stairs and began my ascent. Then he went Jeckyll and Hyde on me. He hissed and chased me up the stairs clawing at my calves. Crazy cat.
I still see him from time to time at dad's place and fortunately I haven't had a similar experience with him.
I wonder what made him flip out like that.