Creepy Crawlies are most likely a prank device designed to scare the victim. As 'creepy crawlies' often refers to insects, arachnids, myriapods (e.g. Centipedes and Millipedes) and other invertebrates, they might be an assortment of insects. They were sold at Weasleys' Wizard Wheezes.
- Harry Potter and the Half-Blood Prince (film) (First mentioned)