A friend asked my son if he was doing compulsive RE at the dinner table the other night. My son said yes, not really knowing what his friend had asked.
I explained the difference between compulsory and compulsive and then improvised someone with 'compulsive RE' disorder that meant they were constantly genuflecting to everyday objects, getting down on their knees to pray and singing hymns.
Everyone joined in with their ideas and we had a laugh.
Maybe they both learnt the meaning of the two words?
Mistakes come in many forms, from the impertinent, to the accidental, but as Greyson Perry says about art and creativity, 'Creativity is mistakes.' And sometimes very funny.