Full disclosure: This sweet boy is the friendliest cat in the world. He looks ferocious in the photo because I accidentally snapped the shutter at the exact right moment when he was mid yawn. Our whole family finds this photo very funny.

siggy47

Sometimes they may act as if they don't recognize you at all. This is because their clear vision needs to be at around 20 cm away from eyes. If you're further away, you're a potential prey or threat. They might not recognize you, especially if they're sleepy.