Few would consider math problems to be an engrossing read but Jason Shiga‘s Fleep is riveting.
In the author’s own words:
It’s about a boy who wakes up in a telephone booth which has been mysteriously selaed in an envelope of concrete. Using only the contents of his pockets (two pens, a paperback novel, three coins and 20 ft of unwaxed dental floss) our hero must fashion and execute an escape plan before he runs out of oxygen.
The comic is 44 strips long and I dare you to stop reading after 22. It’s impossible. Impossible, I tell you!
(Link obtained from MeFi.)