When the pace is sane it's not a bad job, unless people send food back, the cook makes a mistake, the guest doesn't like their food, you get triple sat within the space of two minutes, someone doesn't like and complains, the manager doesn't like you so you have to bury a mistake and you're not sure you can pull it off.....and this is when the pace is sane. Juggle all of that insanity when it's busy and you will understand why being a waiter is ranked by the federal government as one of the most stressful jobs out there. I can see that you have never waited tables - otherwise you'd never make that remark.
Something else - I take a great deal of pride in the fact that I've never done anything funky with a guest's food. I believe in food and beverage karma - this is a big reason I've never done it though over the years I've had a few people I've thought about doing it to but I just couldn't do it. Beyond food and beverage karma I didn't want to stoop down to their level and two of the three times the economy was doing much better than now and I had money saved - much better that if I had gotten in trouble for nothing that was my fault/nothing that I had control over that I just jump ship as at the time, it was very easy to replace a serving job. I also would not want to live with myself knowing I had done something funky to someone else's food.
But I'm going to be honest here - treat your server horribly and there are those with thick skin that let it slide off them, there are those like me who will milk it if they think they can to get a better schedule, and there are those who will do something funky with your food to retaliate. Treat your wait staff at least neutrally and you won't have to worry about this. And it does happen. I've read online about cops finding spit in their food after driving off from fast food places and busting the person who did it and in this instance, I can say I side with the cop unless they were extremely abusive towards the employee. And I mean really really bad and disrespectful towards the employee. Otherwise I'd side with the cop on this one as it's really lowdown nasty behavior. Rob