I am usually up at the computer long before Pär wakes in the morning. After a couple of hours, I come back to bed and snuggle him to wake him up. This morning I lay down back to back with him, and nudged my butt up against his.

"Clash of the Butts," I said.

"My butt is mighty," came his sleepy voice over my shoulder.

"Mine is mightier," I said.

"No. Yours has shrunk down to a fraction of its former might."

"It's still mightier than yours," I said. "Mine is the superior posterior."

"Mine is the inferior posterior," he admitted.

"My butt is gluteus maximus."

"Mine is gluteus minimus."

"My butt is played by Russell Crowe!" I announced triumphantly.

Mournfully, Pär sighed, "Mine is played by Michael J. Fox."

I burst out laughing and couldn't stop.

"Or Joe Pesci," he said.

"Oh honey, it's not that puny..."

"Or Danny DeVito."

I stopped laughing and edged away from him. "Okay, now I don't want to share a bed with your butt."

"Sure ya do, baby," he said, and I started laughing again.

It later occurred to me that he was trying to do a sleazy Danny DeVito voice. Fortunately, I didn't realise it at the time.