Well, if Fred and George had to go to St Mungos every time an experiment (literally) blew up in their faces, they'd lose all the profit the joke shop made! They must have picked up some stuff from the infirmary at Hogwarts, considering they were beaters they must have had a fair few scrapes.
I was watching One piece again yesterday, and in episode 184 Sanji has this outfit (when he's been blown to pieces and they're trying to heal him), and I was just so "omg KAWAIII!
" I just had to draw the twins like this!
Fred's always the one who wants to take things a little further in the explosive direction, George being the one who usually has to remind him that their customers probably don't really WANT to be blasted through a wall from eating a cupcake, no matter how hillarious it may seem at the time. XD