Here are some simple instructions in how to earn extra brownie points with a pre-emptive apology.

Why wait until someone yells at you for doing something wrong, when you can pre-empt them with a ready apology.

Example: You walk in late to your wedding, and as you hit the aisle you yell down at the waiting assembly, "I am so sorry to keep you all waiting, what was I thinking" Follow that up with an excellent excuse, " I was considering not coming at all,  as you see, I have this commitment problem".. quickly followed by, "please forgive me. Now where were we?"

you have neatly pre-empted any comments, in fact you will probably leave the whole room speechless.

Pre-emptive apologies must only be said once, then quickly look as if nothing at all has happened and go on with your day. Any follow up apology will kill the whole effect.  Go ahead and try this tomorrow. And if you are not getting married tomorrow, fyou might consider it if you want to cut into the line at Starbucks in the morning.

(I take no responsibility or liability for the outcome)