I started as a server for about 4 years, and worked as a Night Club bartender for 6 years.
I haven't sabotaged people's food because I would literally destroy someone for doing that to me.
When I first started as a server, I was serving a couple cops and they ordered a vegetarian pizza. I rang it in, and asked for extra sausage, and extra bacon because I thought I was being clever "Bacon, Pig, get it? lolz" and had recently had a couple bad experiences with the police and speeding tickets.
The kitchen guys were laughing their azses off as I left the kitchen, but I was actually pretty nervous bringing it out to the table, when I put it down, the cops actually laughed and ate it. The fat one said he only ordered vegetarian because his wife put him on a diet but he was happy with the bacon and sausage on it.
When I was bartending I had sex pretty much everywhere you can think of in the club. Washroom, managers office, VIP couches, Beer Fridge, Wine Cellar etc....
Girls at a high end club seem to think bartenders are some kind of big deal after they have had a few drinks, and we aren't hammered, unlike most of the other guys in the club.