1. As soon as your nose starts running, you realize that you can't find any tissues, even if there were three packs of them around the place yesterday.
2. As soon as you drag your sick and sorry ass to the store, buy some, and get home, all the lost tissues mysteriously reappear.
3. As soon as you realize that you have lots of tissues, your nose totally stops running and the runny nose is immediately replaced by sore throat and awful coughing.