Made famous by Tim Buckley of CAD fame.
It is often associated with a lack of writing aptitude, in that the writer is unable to artfully craft humor and must, instead, resort to prolonging the punchline to the extent that it is lost in text. In every situation of a buckleybox, it is possible to remove the box entirely while simultaneously improving the quality of the humor.
CTRL-ALT-DEL uses way too many buckleyboxes. Penny Arcade tends to be significantly funnier and contains significantly less buckleyboxes.