Oh no T, better yet is install or activate the tracking system, that is even more fun when they try and figure out how you know where they have been.
Other fun things are live feed pin cameras installed in vehicles, really messes with folks.
A cheap simple old school trick is to take a cassette recorder set it to long play attach it under the seat or in dead space of the armrest and hit record right before they leave.
Nowadays there are mountable ant mikes that you can install anywhere and it transmits the audio to a recorder by wireless.
To bad the momma wont let me do anything of those things...yet.
