What is the secret formula for scaring someone [No cheap scares!]

[Adny]

I believe this is the formula:


With =6.022 141 79(30)×1023 mol−1

+1 To the first one who knows what formula this is actually for.

I believe your equation isn't so much for scaring, but more so for activity of a quantity radioactive material where one nucleus decays per second. Or something of that nature. (Am I right? )