"R — r — riddikulus! "squeaked Neville.
There was a noise like a whip crack. Snape stumbled; he was wearing a long, lace-trimmed dress and a towering hat topped with a moth-eaten vulture, and he was swinging a huge crimson handbag.
There was a roar of laughter; the boggart paused, confused, and Professor Lupin shouted, “Parvati! Forward!”
(Source: simplypotterheads, via rickmaniac-love)