How I Accidentally Called 911 on Christmas

So. . . .Dave and Annie and came over to Shawn's parents house to hang out with us on Christmas. Their daughter, Maddy, was very intrigued with an old phone that is in the basement. Since it was so late (instead of calling the house phone so she could answer) we dialed her Daddy's number from the phone. Maddy had the phone to her ear and I could hear a woman's voice. So, I figured it was voicemail and hung up. Immediately upon hanging up, the phone rang. I answered (because I didn't want it to wake up Jim and Carol) and a woman says, "Hi this is 911. We just had a hang up." I said, "What?! I was trying to dial (so and so #)." I told her it was a mistake and I honestly didn't know how it happened. She told me that they would send an officer out because it was routine. About five minutes (close to an hour later) after Dave and Annie left, the police officer arrived. I said, "I'm sorry. We have this old phone downstairs and we were trying to dial a cell #. I honestly don't know how it happened." He asked me if everything was alright and left. I felt sooooo ridiculous. I am still ticked and embarrassed to talk about it. The only way I can figure it happened is some of the buttons on the phone didn't work and the number I was dialing did have a 9 and a 1 next to each other. Boy, was that one embarrassing moment.