I see cats....again!

I didn't travel far this weekend, in a bid to save fuel but I did need to make a trip down to the shop yesterday evening for bread and milk. I decided to visit a different shop from my usual one. This shop is also very busy and noisy, with music played quite loud. I had picked up a couple of loaves and some sachets of milk and was wandering in the direction of the shelves of eggs....when a movement caught my eye. On the top shelf just behind the eggs was a kitten, an adolescent beautiful grey kitty. She had been ducking down behind the eggs and peering over the edge of the shelf, waiting for the people to clear so she could make a run for it. I don't know how she thought she would do that since she was at the back of the shop and the place was teeming with shoppers. Just then she spotted me spotting her and hissed at me. Little wild child. I spoke to her, trying not to draw the other shoppers attention to her because I don't think a cat in a shop would go down well. As I spoke to her, she meowed to me and then retreated to the windowsill and just looked at me. I left her then and wandered a bit further on. When I looked again, she had gone. She was very scared because of the noise and clamour. Maybe she had wandered in through some vent or hole overnight and had become disorientated. I hate to see beautiful cats living wild because I know that even wild cats can be tamed and become loving and loved pets. What also amazed me is that the other shoppers couldn't see her. She wasn't invisible. She could be seen but no one else even showed that they had seen her. Is it just me? Am I the cat spotter?