How do you tell when you're out of Invisible Ink?!

Question: That's gotta be one of the best ones I've seen...or not seen as the case may be.

Answers: That's gotta be one of the best ones I've seen...or not seen as the case may be.

When you see non-invisible ink.

When people start getting mad at me when they see what I wrote. OOps

The fire alarm goes off.

It's special. :D

when you see ink

The pen makes a buzzing noise!

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