I found that grapefruit with caffein isn't good. Came home on a frigid cold day, had some hot strong tea and a gralefruit. Went to hospital 20 mins later with the most rapid heartbeat. Got scolded big time.
In college, a friend was driving into town and accidently hit a car. There were a lot of people who saw it. He took a piece of paper and wrote a note. He showed me, it said: I hit your car. I'm sorry about it. There are a lot of people watching who think I am writing a note with my name and phone number. I'm not.