This is something I might have tried to do back in high school, but definitely not in college.
On the first test of day of the semester, Assistant professor Reb Beatty at Anne Arundel Community College in Maryland got a pretty big surprise, pun intended, when one student brought in a 3×5 foot poster of notes.
See, Professor Beatty allows his students to use a 3×5 inch card for notes, which is pretty common in college for tests.
However, he never actually specified a unit of measurement on the syllabus which led to the following:
He was a good sport about it, as you can see by the comments, and allowed the student to use the notes. Here’s hoping he got an A on the test!