When your teacher allows a small notecard for a test, it's always a mission to try and shrink your handwriting to cram in as much knowledge as humanly possible on a tiny space.

However, one teacher found out that specifying just how small the notecard should be is absolutely imperative.

Accounting professor Reb Beatty usually allows his students a 3x5 notecard for their first test of the semester... and whilst most of his students infer '3x5' to be inches, one student brought this along:

Credit: Reb Beatty, Facebook

Reb's failure to specify 3x5 inches led student Elijah Bowen to bring in a 3x5...FOOT notecard.

Rather than disallowing Elijah's notecard, Reb commended the ingenuity of it, allowing him to keep it for the test!

In a Facebook post that's now gone viral, Reb wrote

'As precise as I am, apparently I never specified inches and therefore yes, it was allowed. Well played and lesson learned for me'

Many people have been enjoying both Reb's error and Elijah's genius:

We're yet to find out if Elijah actually passed the test, but either way, he's definitely acing life.