Only in the media is 20% the norm, and frankly I'm tired of "tip creep" because some new article says X% is what we should all be doing now or we're bad customers who don't appreciate how difficult life is for waitstaff.

A tip is a reward for good to excellent service. I tip according to service received, and will continue to do so no matter what journalists and bloggers have to say about what percent they think we should be handing over without regard to the quality of the service.