Ooh, so many replies this morning! Thanks for the congrats, everyone.
Wildsky,
Surprisingly, nobody seems to think I'm crazy for having chickens, OR they thought I was crazy anyway, so the chickens didn't surprise them.
Zippity-do-dah and Churkenduse,
It wasn't warm.
I checked the nestbox that morning, DH said he checked it early in the day, too. I found the egg after 5pm, when I went out to play with the girls before bedtime.
For everybody who isn't getting eggs yet, take heart! The days are getting longer and eggs are just around the corner. I'm not even supplementing light in the coop. When Precious started squatting, I got really excited and started opening up the coop as soon as the sun peeked over the ridge. No more lazy mornings with coffee and the computer, well not until after I let the chickens out anyway.