Person A: "I created a web page. I'll let you view it if you also look at this advertisement"
Person B: "No, I don't agree to your condition. I'll just view the page without the advertisement"
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Person A: "I've built this car. I'll let you drive it if you keep the speed under 60 miles per hour"
Person B: "No, I don't agree to your condition. I'll just drive your car and go at whatever speed I like"
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Person A: "I baked a cake. I'll let you eat it if you give me $5"
Person B: "No, I don't agree to your condition. I'll just eat the cake and give you nothing"