There are so many things wrong with this. As I have in the past, I will conveniently list out said offenses for you now.
1. If you're putting the total cost on the tip line, than you aren't nearly doubling your tab, you are literally doubling it. 16+16=16 doubled.
2. Don't parade your dumb-ass life mistakes around facebook. It's not cute and quirky... its dumb-ass.
3. Maybe if you spent less time at the bar and more time doing anything else, you wouldn't make such mistakes.