What did Fred and George use to protest against Dolores Umbridge's authority?
Weasley's Wildfire Whiz-bangs
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What did Fred and George use to protest against Dolores Umbridge's authority? [/INST] Weasley's Wildfire Whiz-bangs </s>