After having been on the lash or as over 30's call it 'a night out' most people wana throw up. The moment where you feel the need to talk to Uncle Barry will eventually hit you. It is the moment at which you start throwing up down the toilet.
Example 1,
Person 1: Should we help Mackie out he looks kinda rough?!
Person 2: Na it’s OK he’s just having a chat with Uncle Barry.
Example 2,
Goin out on the lash tonight, hope I don’t end up talking to Uncle Barry!
The sudden inexplicable inability to demonstrate an action to an audience specifically summoned to view said action.
This phenomenon receives its name from the premise of a pet "talking" parrot who is suddenly silent when guests are invited to see it "talk." "I swear!," says the owner, "He says all kinds of stuff! He says 'hello', he says our names! Really! I don't know why he won't do it now...." while the guests nod and say, "Suuure, he talks. We totally believe you."
EXAMPLE:
You "Every time I try to load this page I get a weird error message. I restarted and everything. Come in here and look at this."
IT Employee: "OK, show me what it's doing."
You: Repeat action that has resulted in a error 17 times in a row. Page now loads no problem. "I swear, it was giving me an error every single time before you were standing here. Talking Parrot Phenomenon, right there."