When they get on the train with viagra, and she can hear
churchbells chime

The story:

Me and my friend saw guys and dolls when we were 9, and our
favorite song has always been Adelaide's Lament
Last year, my friend and I got cast in guys and dolls, I was Sarah
and she was Adelaide.
She was singing Adelaide's Lament, and she sang it wrong, but
that's how we had always sung it. Our director thought it was the
most hilarious thing ever