When my OH does similar things I try very hard to tell myself that they're just 'things', but it doesn't stop me getting upset and angry, especially as I'm someone who really takes care of things. Even when I put ornaments safely at the back of the windowsill, he still manages to catch them with something he's carrying because he can't see what he's doing and they end up broken. Plants in the garden are either trodden on as he 'didn't realise it was there' - erm, it's a flowerbed, the clue's in the name - or he just yanks them up as 'it looked like a weed' . . . I've lost count of the number of plants I've lost one way or another I've been very tempted to treat his things the same way just so that he realises how upsetting it is, but I just don't have it in me!! I'm not a shouty person, but I do let him know how upset I am. He just doesn't get it! I know it's not intentional, so I just take to my yoga 'ommmmmmmmmmmmmmm' until I'm calmer