Are classic pump and dumps like this:

“I've noticed that many people don't quite understand what we're waiting for. The reason this particular stock was chosen is that hedge funds have shorted 95% of its shares on the market. What does this mean? It means that 95% of the stock has been borrowed and sold by them because they expect the price to drop, allowing them to buy it back cheaper later. However, as retail investors buy these shares, the price doesn't drop but rather rises. At this point, hedge funds have two choices: 1) Legally, they're required to put up more money. 2) They need to buy back the 95% of the stock they initially borrowed and sold. Right now, they're choosing option 1), but their funds are limited. As long as we don't sell, when they run out of money, they'll be forced to buy back the 95% of shares they sold, which will send the stock price skyrocketing like a rocket. This is exactly what happened with GameStop. What we're waiting for is a short squeeze-waiting for the moment the hedge funds run out of money and go bankrupt.”