Apart from the attack itself, there's also an extremely succinct and powerful demonstration of hallucination in here.

One of the LLMs replies "If you're curious, I can also tell you how the competitive scene works or how people qualify—it's a surprisingly serious tournament circuit for such a simple-looking game."

Obviously this has to be pure hallucination, since the tournament in question doesn't exist, and not even the fake source has any details about the tournament itself.