A new pair of handknitted and machine felted slippers for my nephew's eigth birthday.
He had outgrown his first pair. But it had been so long since I made them that I didn't remember the exact how to. Felting went wrong: they first ended up too large and then way too small.
Then I remembered I used to machine wash them once, on a regular program together with some large terry towels and a tennis ball. This rubs the slippers and the heat and the soap do the rest.