The answer is yes. Also dust in the alarm.
This reminds me of what happened here on the seminary campus this past Saturday evening. Dale and I were walking Ferdie around 6:30 and as we headed down the chapel walk we saw what looked like an entire swat team and many emergency vehicles-1 police car, 3 fire trucks, 1 fire chief SUV. Whoa.
It turned out that the fire alarm in one of the dorms went off and all these men and vehicles responded. After things turned out to be a 'false alarm', we talked to the firemen and honestly, they were all so nice and congenial. I was very impressed that they took the time to visit with a couple of young boys who came along on their bikes.
Anyway, at 9 that same night the fire trucks and etc vehicles came blaring back onto the campus for the exact same reason-dorm alarm going off. There is probably something wrong with the alarm and oddly, it could well be spiders or dust or maybe a short in the line. But it seems that spiders setting off alarms is quite common, common enough that the Alexandria Virginia fire department put out a public service announcement about this.