Security Alarm triggered

Lynettea went out to the theatre to see Australian Youth Ballet perform the Nutcracker this evening.
When she got home the blue light was flashing, but there was nothing wrong that she could see. She thinks I SASHA might have triggered it.
Why would I have wanted to do that? A loud noise that went on and on.
'Oh, poor Sasha,' she said. you must have had a nasty time.'
'A pity you could not have come to the ballet, where there were a lot of mice. You would have enjoyed it.'