stupid fire alarm

So we had an eventful Friday night. Around 10 pm our fire alarm started chirping. I thought ok just change the battery. I had to run to the store to buy one. While I was gone the old battery was out, and Matt said that it was still chirping. I found that odd because there was no battery, but whatever. So i put the new battery in and it still chirped. After like an hour of trying to figure it out we decided to call the non emergency fire dept. I spoke with a lady in a very calm matter and just asked what she thought we should do. She gave a few suggestions, none of which worked. Then she said that she could send someone out to help. I thought ok why not since there was no way I was going to be able to sleep with that chirping. Not more than 5 or 10 min later we hear sirens coming. I said to Matt that better not be coming to our house. Oh they did. A fire truck and ambulance! How embarrassing is that! They totally got out with their tanks and gear and started monitoring our building. I really don't understand what the lady told them that would make them act this way. They were going around with a carbon monoxide machine and there was like 6 of them. I felt so stupid. I know I told the lady that the carbon monoxide was not going off but whatever. So then I explain to the firefighters that it's really just my fire alarm not working. They tried to figure it out. Then all the sudden they were like is there another alarm around this one. I didn't think so but I opened our spare bedroom and saw that there was one in there. Then I felt even more stupid because now we thought it was that one that was chirping. We changed that battery and still chirping. We finally figured that it was the original one that was having issues. They had it totally detached from all power and battery and it still chirped. It was just a faulty alarm. I felt really silly for having them all come but I don't think I would have ever figured it out with out there help so whatever. No more chirping!