One of ours does Shine a torch and he's scrabbling all over the place trying to catch the light. My watch face reflected the sunlight and we couldn't understand why he was suddenly racing around the room, until we saw what he was looking at.
I've just been letting him chase a torch light up the wall. And since I've turned it off he just sits for ages staring at the wall wondering where it went He just can't figure this light business out.
Our other cat couldnt give a stuff about chasing lights. He's more of an attack your foot throught the duvet sort of character.
I have two, my little tabby is the most ferocious hunter and avidly stalks the laser pointer, never gets tired of it! My older Russian Blue just watches her race round the room with a bemused expression as if to say 'she really has no clue, naive little thing'. Then he gets cross and jumps on her and the fur flying begins....