I remember when I first found out about Mikory's ABBA Blog, I came across one of his posts he wrote about when he met ABBA in 1974. I read it once and couldn't find it every again. After searching a lot today, I finally came across it using the keyword: "restroom". :P (You'll see what I mean.)
Read it here.
Bjorn and Benny must have been really grouchy at the time...