When I was little I always read 'Menswear' in department stores as 'Men swear', which was the funniest thing in the world to me aged about 6 or 7.
I used to get very puzzled by those road signs that say no entry 'except for access' - I'd seen the Access card ads on the telly and thought the signs meant you needed an Access card to be allowed to pass the sign.
I also remember getting quite confused at school when we started doing the Egyptians and learning about the Pharaohs; we used to have Radio 4 on a lot at home and I'd heard the shipping forecast many many times, so my brain got a bit scrambled trying to work out what the Faeroes had to do with Egypt.
Similar confusion when I first heard of the Brecon Beacons; thought they were a variant of Belisha beacons.
And epic levels of confusion reigned for a week during primary school when my teacher was reading The Lion, the Witch and the Wardrobe to us in instalments, and ended one segment on (I thought) 'They say Aslan is on the moon.' I was almost disappointed to discover he was only on the move.
Ah, the never-ending inventiveness of a child's brain. 😄