DH and I were chatting with 18yo DS over dinner about him getting the vaccine. DS said he'd like to know why people's arms are magnetic at the site of vaccine after vaccination, before he has his. Cue DH and I pressing fridge magnets to put arms, and DS seeming surprised when the didn't stick!
He's a bright lad, why on earth he would have thought that was a thing I've no idea, but I think I've heard it all now.