S.F. Jude Terror wrote:What the hell is a head cannon?
Used by followers of various media of entertainment, such as television shows, movies, books, etc. to note a particular belief which has not been used in the universe of whatever program or story they follow, but seems to make sense to that particular individual, and as such is adopted as a sort of "personal canon". Headcanon may be upgraded to canon if it is incorporated into the program or story's universe.
For example, Dick Grayson would have force Damian to watch Walt Disney movies (Because Bruce would never do that with Damian) with him and despite the irritation of Damian he secretly enjoys them.