Hokay.... "Smart Mattress Alerts You When It Detects It's Being Used By A Stranger"
This is bound to end infidelity once and for all
Technology watchdog @internetofshit brought to our attention the Smarttress: a mattress intended, according to its inventor, to combat Spain's terrible reputation for adultery. It incorporates an array of 24 ultrasonic sensors and a finely tuned algoritmo that reads the frequency and intensity of bouncing on its surface.
When certain telltale signs are detected -- not just the cat on the bed again -- a battery-powered communication module alerts the owner's smartphone. The owner must then race home and deal with his or her marital strife firsthand, since this version of the mattress does not incorporate any remotely deployable ejection devices or other automated hanky-panky deterrents.
http://www.popsci.com/mattress-with-sensors-texts-you-when-it-detects-questionable-usage
Next obvious use - wire it up to a bedroom cam that can be accessed remotely. Of course, if you're that far down the road of distrust, you probably shouldn't be together with that partner to begin with.
= new reply since forum marked as read
could have come in handy 
It's OK, I never let her sleep on your side of the bed and we always had sex on my side, you mad? 
I could have been out of there before I had to hear that!
