Beware!

I worked Monday, Tuesday, and Wednesday at the public library while the librarian was on vacation. I cleared the computer area, scanned the library with my eyes (small library...just one room), then left promptly at 5 p.m. At 5:30 I receive a call from a friend who works for the sheriff's department. Dispatch called her...someone was locked in the library! He'd been in the restroom...and by my guesstimate for 15 minutes or more!