Your best friend arrives at your door at a time when you know that they should be at work/school/whatever. They're wearing blood-stained clothes and have the look of someone who's been through hell in their eyes. They hand you a shotgun and say "There isn't time to explain, but we need to move. now.", and directs you towards a car that isn't theirs.
Do you follow them?
EDIT: What if they tell you that your life and the lives of many others depend on it?