Well the one I met tried to kill me and my sister and our friends because it could. Made me think my friend was dead. Tried to then trick me into attacking her.

And then when we'd frozen it, it turned into me and basically said this was the last form I'd ever take and then froze like it was me screaming in agony.

[Probably one of the worst adventures. And no Soos, he did not sleep that night.]