What part of "Can I please have no tomatoes?" makes you think I would like one slice of tomato? Where did this judgement happen? Was it after you heard my order? You must have thought, "Oh, he's just playing hard to get. I'll just slip this tomato in there to make sure he knows I care."
Was it while you were cooking it? "Okay. I'm almost done cooking this thing. But I've already filled my 'Do things perfectly' quota for today, so I better **** this **** up."
It was probably while I was talking to you about how much I don't like tomatoes. "This *****. You need to learn that tomatoes are good for you. I'll show you!"
Actually, scratch all that. Knowing where you work, it was probably when you were counting how many tomatoes I wanted. "Hmm...let's see, how many tomatoes was I supposed to put? Oh yeah. Zero. Now let's see...how many tomatoes did I put? *Sees tomato slice that should not be there* Zero. Alright, cool."