When I married my current spouse I was to discover he came with a sister that was Lucifer's evil twin sister in a previous life. I noticed things were askew in the bath after she stayed for a few days on her first visit. Subsequent visits also were accompanied by items in the bathroom off the master bedroom being out of place.
Suspecting her of snooping and no action by the other half to contain his sister's behavior I took it upon myself to set a trap in the medicine cabinet. There are internet enabled security cameras that not only record video and sound, but send an alert to the owner that activity has been detected. Using double sided tape such a camera was mounted to the top shelf in the medicine cabinet. Power was tapped from the light bar above the medicine cabinet. The camera was linked to the home network via WiFi. Soon as a mark would open the medicine cabinet door, the camera would send a text message alerting me of motion detection.
About a week later the sister-in-law arrived for what had become her annual spring visit to escape the cold New England weather. While I was preparing dinner the evening of her arrival, the SIL excused herself to wash up prior to joining us for dinner. In a few minutes there was a loud ‘whoop’ from the direction of the master bedroom. As I turned to see why Diane had let out a startled loud whoop my phone vibrated alerting me the camera had detected activity. As I entered the hallway Diane blew past me, grabbed her coat, dashed out the front door, jumped into her car and left with screeching tires.
“Victoria, what have you done?” The other half said as he walked back to the bedroom. In a moment I heard guffawing laughter. Dee walked out of the bath and commented, “Victoria, that was just downright mean. The camera I sort of understand, but the placard with, 'Smile, you're on Candid Camera' was ruthless."
It has been five years and the SIL has not visited us again. Best $65.00 I ever spent.