Mob mentality might be 99.9% scary, but there's certain times it can be kind of cool. Take what happened after this Foo Fighters concert in Ireland, where a whole slew of people decided to get amped about a PA announcement.

via Conor Steenson

Having gotten them on board with everything she was saying, the PA announcer could've told the whole crowd to do the hokey pokey, sing her a song, or even overthrow the government if she wanted. Those sheeple were at her mercy.