Gurgle Gut

Gurgle Gut is a pranking elixir mentioned in the Barnes and Noble Nightfall special edition section, on Keefe's first day on bed rest. After he had slipped Ro a hush slush, he believes that she may have put this elixir in to his breakfast. Through this it is also seen that he is familiar with the solution, or at least it's effects, that are described to make the victim queasy. In the case he was right about Ro pranking him back with this, they apparently would both equally suffer when the gurgles broke free.