A likkle wedding joke

On her wedding day, the bride's mother took her aside and gave her some advice about getting through her big day. "When you get to the Church," she said, "You'll see the aisle: you have to walk sedately up the aisle." The girl nodded obediently and made a mental note: "Aisle." "Then," her mother continued, "when you walk up the aisle, you reach the alter: you must be poised and composed at the altar." The girl nodded dutifully, making a second mental note: "Altar." "Finally," the lady concluded, "You will stand beside him at the altar." The girl made a third mental note: "Him." "Got it!" she said, and all the way through her big day she kept repeating to herself "Aisle. Altar. Him."