Yeah, the ad is a bit off and doesn't really get its point across very well. Salad woman should have been made to suffer with her salad - if you don't think your meal options through before ordering, its your own fault and no one should have to suffer because of it. I know its an ad though and they were trying to make it sound like beef is the "best" yum

but it was a really bad way of making their point imo.
If my DH and I want to share meals, we always discuss it first before ordering, that way we both get something we want and work out how to divvy it up to ensure that either party doesn't go hungry as sometimes the meal proportions differ depending on what dish is ordered.
If one of us ordered a meal and decided to 'share' by taking the other half's meal like what happened in the tv ad - quite honestly we would be peeved off! I know I would be! Eat your own meal and keep your hands off mine!
But in saying that, we do taste each other's meals if one of us gets something different and want to compare flavours or want to comment on how good it is - we do this quite often but we don't do it without asking and only take a small bit.