The Government is watching... cameras are everywhere... SO YOU MIGHT AS WELL JOIN IN ON THE FUN!
Get some night vision cameras, they're great for home security or just making fun 'Blair Witch Project'-like found footage movies.
This easy to install HD camera stores its recordings by SD card in AVI format making sure you get your full 1080p when you show up at divorce court with proof that your spouse picks their nose and farts at the door every day before walking in. WHERE'S THE TRUST AND VULNERABILITY MARTHA?!