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1.
The system of counting used by Buzz, the fat older jock brother in Home Alone.

Basically it's useful, if you want to list three things. Instead of 1, 2, 3 or A, B, C...

A, 2 and D are used.
a) I'm not that lucky
2) We have smoke detectors.
d) We live in the most boring street in the United States, where nothing remotely interesting will *EVER* happen, period.