Scenario: Weird sound heard when talking to Cher on the telephone

Jem: What's that sound!?
Cher: I'm scratching my bolster. ( she pronounced it ball-ster!but she was unaware)

Jem laughs hysterically.

Cher: What!?
Jem: You sounded as though you said you were scratching your balls!
Jem: Is there something you wanna tell me?