ABBA really had a hard work not only at the studios, but also at their office. Just look at the following pictures and you'll see how serious their work was.
Benny: "Hello! Who is it?"
Björn: "What do you think it is?"
Benny: "Oh, Agnetha? How are you? May I talk to Björn, please?"
Björn: "Don't you recognize my voice?!"
Benny: "Of course I do, Anna. You sound like an angel, you know? But I really have to talk to your husband."
Björn: "But It's ME!"
Björn: "Now you see?"
Benny: "Well... if Björn can't talk to me now, please, ask him to call me later! Bye bye!"
Björn: "Benny?! WHAT THE HELL?!"