The Book of General Ignorance round differs, in particular during the Christmas specials. During the course of the "B" Series special, Fry and Davies swapped places for "General Ignorance", with Fry attempting to answer questions ostensibly written by Davies to stump him. During "D"s Christmas Special, all the "GI" questions revolved around saints. "The Book of General Ignorance" contains a list of 230 questions, most of which previously appeared in episodes of "QI". Each question explains the correct answer, and usually attempts to show why people tend to make the wrong assumptions, or believe certain myths. Each book contains two forewords, one by Fry, the
Grandad (Only Fools and Horses) his wife Violet sometime before the war, and fathering a son, Reg. During World War II Grandad evidently served some time in the army as he told Del he was given a double-headed coin by a fellow soldier and his son Reg checked his blood group on his old army records, however he must have been demobbed before the end of war as he temporarily separated from his wife and had an affair with Trigger's grandmother Alice, while her husband Arthur was still fighting. During the episode "He Ain't Heavy, He's My Uncle", Uncle Albert (Buster Merryfield) shows Del a