You invite a friend over, but raccoon appears. Then pigeon appears. Then friend appears but at the last second suddenly becomes a banana. You remember you are out of bananas so you order more and also some cola zero cans on your local grocery delivery app. You are back to the party, but now you have 5 friends in the room, and you run de-duplication query. Now half of your friend is sitting at the sofa, and another half becomes a quarter of banana. Suddenly bananas arrive so you need to open the door. Once you are back there are no friends, pigeons or raccoons but also no bananas and no cola - all the delivery results are gone. This seems to be urgent and important, gotta fix this first before going back to that friend invitation...