Try a Ruler

Beginning to grow concerned, Miss Rowe reaches across the desk, snatching up a ruler. She tries to keep her movements slow and steady, but she clocks that at least two students in the front row have already started giving her odd looks.

Sliding the ruler casually off the desk, Miss Rowe runs the thinnest edge of the ruler against her skirt, trying in vain to slide it between her skirt and the chair. Surely there's no glue in existence that doesn't leave at least a little bit of a gap.

After a few minutes of nothing more than rubbing the ruler against her legs, the panic begins to grow stronger.