Just tell me when....

I have disturbing experiences in the past. One in particular is going to a restaurant (Olive Garden stands out in my mind because it happens to be my favorite restaurant and it's also one of the greatest offenders with these disturbances) and they start like putting cheese on your soup or cutting your meat to a right size and they say "Tell me when." My first problem is why "when"? Really who actually says when? Why not say "Tell me when TO STOP." that would be so much simpler. Plus when and when you do say when, they don't take that as the que to stop. But yet when you say something that they didn't tell you to say, such as "That's good." they do stop. Then when you do finally say that you want them to stop in some way or another, they take like 2 seconds to actually stop. If they give you an option on when to stop, they should honor that option instead of taking their own little opinion on when with just a little use of the input you gave moments ago. For some reason that bugs me, but really I bet it bugs many people but they just aren't open about it. How StRaNgE....