Math professor Charles Dodgson (a.k.a. Lewis Carroll) learns how NOT to perform post-prandial high-stakes testing…
Ah yes… perhaps you recall our River Crossing Puzzle?
Dodgson’s letter relating this “Awful Puzzle Story” episode (& more) can be found in the following book:
The Lewis Carroll Picture Book (@Archive.org) (see p.214)
Aaaaand just for good measure, here’s the page-format version of this comic:
www.MarekBennett.com 
i loved your art and thank you for coming to my school and im a ZEBRA