MNEMONIC
WOW: prime. Sometimes it's easier for an outside observer to see the obvious.
Disclaimer: Don't own them.
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"GODDAMNIT SAM!"
Castiel hurried down to the bunker's vaults on hearing Dean's outburst to find his friend kneeling before a heavy metal door, angrily rattling the lock.
"What is wrong Dean?"
"It's freakin' Sam," Dean snorted; "he changed the lock's combination, and now he's gone out, and I don't know what it is!"
"Oh," Castiel replied unhelpfully.
"I've tried odd numbers, even numbers, prime numbers, birth dates, pi, the Fibonacci sequence, our ages, and nothing works. How the hell am I supposed to finish this incantation we need?"
Castiel pondered silently for a moment. "Try 4, 5, 1, 14," he eventually suggested.
Dean hesitated before turning back to the lock and punching in the numbers.
Both man and angel stood back and watched in awe as the lock smoothly clicked, and the door swung open with a pained creak.
"But, When did … How did …?" Dean muttered, confused. "Did Sam tell you what it was?"
"Not in word, but in deed, Dean," Castiel replied with a smile; "every day, ever since I've known you both."
Dean shrugged, uncomprehending.
"Everyone sets a combination that is important to them; something unforgettable, and Sam is no different."
"The numbers represent letters. The letters spell 'D-E-A-N'."
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end