Sorry, a little prank on April Fools day.

• SWI-Prolog doesn't actually comply with ISO JTC1/SC22/WG4, which is the Cobol standard.
• C-c C-q automatically puts a comment box around text
• SWI-Prolog handles Unicode but does not default to EBCDIC
• SWI-Prolog is mostly maintained and expanded by folks in the Netherlands, when they find time between klomping around in wooden shoes, sticking fingers in dykes, eating cheese, and admiring windmills.
• There is no pack antigravity. If you write on, here's how to make it a pack . This joke comes from an XKCD Comic about Python, but applies even more strongly to Prolog.
• box hockey is a rather silly game played with a wooden box . It's often played in the US schools at break time.
• SWI-Prolog does not require OSGi or qPID. The small size of the tools ecosystem is one of the many pleasures of working with SWI-Prolog. This is also an inside joke for some of us who worked for a company that used both of these.