I had a job installing security systems many years ago. There was a grocery store in a slightly isolated area, it had an alarm hooked up with an outside siren and connected to the phone line. It was the 1980s, there were no cellular backups.
The would be safe cracker pulled the outside siren off the wall with his vehicle and cut all of the phone lines, then he broke in and started working on the safe ignoring the inside siren. He had about $1000 worth of power tools in to the back office and started to drill the safe. He didn't count on the baker coming in early to get a start on the day. When the baker showed up, the robber bugged out the back door.
He left behind all of his nice tools.
He did cause the business some hardship, they couldn't access the contents of the safe for about 3 days until the locksmith could replace the parts he had ruined. Insurance paid to fix his safe and alarm system, after that they had their phone lines buried so they couldn't be cut as easily.