The Toilet Lizard is a potential hallucinatory episode experienced by Barry as a child in a pub toilet. Despite Barry's cries to the adults about what he saw, nobody believed him. To this very day, Barry insists the Toilet Lizard was real.
So what's the truth?
Did Livi have unusually high levels of lead in the water during the 90s? Did Barry encounter a shapeshifter? Was there even a pub at all? It's not for us to judge. This anonymous 2 Good Boys listener once saw a parrot just hanging out on a chain link fence in a town centre, so he's willing to give Barry the benefit of the doubt on seeing an exotic animal in an unusual place.