Bad mom: I ran out of patience

In a takeoff of the ParentCenter "Bad Parent" series in which perants confess their bad behavior, I'm sharing my mea culpa from this weekend.
Somewhere between the humidity, PMS, and the two hundredth "mommy, come look a this!" - I lost my patience. It just flat ran out. "You have a friend over today, Daniel." I replied - not in my nicest tone of voice. "Go play with him or he'll have to go home!"
What's the big bad here? I wasn't doing anything worth blowing my kid off for. I was huddled on the couch, watching a movie my roommate had rented. I didn't know if it was kid-friendly or not (turns out it would have been OK) so Daniel couldn't just stand around in the room with me. I had arranged for his friend to come over because they don't see as much of each other as they did when school was in. Frankly, I had hoped to buy myself a couple of "me" hours. And when I didn't get my way, I got cranky (sound like any three-year-olds you know?). So now I have guilt. I'll wallow in it a little while and Daniel will feel the benefit. I did apologize to him klast night: "I know mommy wasn't much fun today, baby, and I'm sorry." He took it in stride: "Can we go to the Toys R Us tonight?" I'm not feeling THAT guilty. "No, but tomorrow after work I'll take you swimming."
--Misty