A neutrino walks into a bar and says "I’d like a beer, please."
After the bartender gives him one, he asks "How much will that be?"
"For you?", the bartender says, "No charge."
An intoxicated neutrino walks into a Mexican bar and says “Una cerveza, por favor!”
The bartender replies, "No mas!”
A scientist looks up, and pronounces, "neutrino's are not Catholic!"
His peer says, "Why do you say that?"
He smiles and replies, "Because they never have Mass."