Bobo Must Go

We had a good book group until Bobo showed up. No one knows how he found out about us. He showed up a half hour late, sat down and removed his shoes and socks to get more comfortable. He pulled out a knapsack and removed several beef jerky sticks and Velveeta cheese. Any beer? he asked.
Our leader Ralph said no beer. It turns out Bobo had only read two chapters of the book, a memoir by Joe Del Priore, "Huddled Masses Yearning to Flee Me."
Bobo nodded a few times as points were made, then decided it was more interesting to relate stories of his days as a mercenary in South America.
After the session ended and he left, we decided Bobo had to go. Eli, A high school chemistry teacher, said he would cook up something that we could slip into a beer bottle, something that would cause quick death and leave the body without a trace.
We took our book discussions quite seriously.