I'll have a sandwich
You're trying to ignore some dumb conversation and someone decides to randomly pick a fight with you. You say 'I'll have a sandwich' and walk off like you just won.
In class, my teacher starts talking about the weekend. I say 'I'll have a sandwich' and start doodling.
At the park, some kid starts arguing about video games. I say 'I'll have a sandwich' and eat my lunch.
At work, my coworker starts telling me about his weekend. I say 'I'll have a sandwich' and go take a break.