The ad shows people in everyday life, with the addition of extra body parts.

-A wedding takes place. We see close-ups of the bride/groom's hands, and we can see five fingers and a thumb.

-A receptionist is filing her nails whilst simultaneously using her extra arm to hold the phone to her ear.

-At a bar, a man with three eyes notices a woman with three breasts.

-A clothes store is seen with clothing to accomodate the extra limbs.

-A jogger is seen with three legs.

-A person with two heads enters a hairdresser.

-A florist give a flower to a two-nosed customer.

(You can suggest extra ideas in your comments)

A voiceover states that some people like a little extra something. Meanwhile, a woman goes to her fridge and gets the product in question. She has a taste of the product, no flavouring, and isn't impressed. She then adds the flavouring and has another taste. She likes it. As soon as she has had a taste of the flavoured product, she grows an extra arm. This impresses her even more.