"One of my grandparents just passed away"
When you were in high school, you probably used the excuse "my parents won't let me go" to get out of something, so thank goodness for old grandparents. And even better, you have 4 of them, so they're a great excuse to get out of a date that you are majorly dreading. You can slowly kill them off, and each new prospect won't know that you've used this excuse before.
[Photo via @nycfiona]