Late last July/early August heard this chirping sound from behind the storage cabinet in my office at work.   Thought it was odd how consistent the interval was but didn’t have time to investigate.  Morning of when I was leaving on vacation contractor whose shop is across the hall couldn’t take it anymore and revealed what he did.  He had this electric sound maker stuck to the back of the tool chest in my office.  I seen the opportunity and asked if I could borrow it.   I tossed it under the seat of my personal pickup and left it there for the vacation.  15 minutes in it started to drive my wife nuts she threatened to rip the pickup apart to find whatever it was.  Day 4 of the outing over 3/4 of the way home it finally came to her that I was behind the chirp.    Tossed it in the cab of someone else’s pic I know.