Sunday shopping. Same-sex marriage. Medical assistance in dying. No legal restrictions on abortion. Those are just some of the momentous changes the charter has wrought since it was entrenched in the newly patriated Constitution on a rainy April day 35 years ago during a black-tie signing ceremony - the solemnity of which was interrupted by justice minister and future prime minister Jean Chretien muttering an oath upon discovering the nib of the pen was broken, provoking a rare regal laugh from the Queen.