Not really, no, unless you've been caught up in a Rocket heist by accident. Hell, not even all Rockets would be willing to try.

But yes, you're right. They can be. [Steven himself used to use Night Shade to scare victims into fainting, back when he used to pull mugging speedruns. Meanwhile, Tyler had been a master of combining Hypnosis and Dream Eater for the purpose of removing people's memories.]