The imagination of guys inventing hidden cameras seems to have no limits. This one is hidden in a tissues dispenser box:

From spygadgets.com.

This pen is perfectly working, including its secret audio recording feature. It can record up to 18 hours, is voice activated, and has an internal playback system as well as a USB interface to upload the recorded sounds to your PC:

Via spycatcheronline.

If you’re fed up with mobile phones and want to create a bubble of quiteness around you, this is for you. This portable device scrambles the GSM and GPS signals, making cell phones and GPS receivers unusable.

Via chinavision.com.

This is an enhanced version of the “cup-agains-the-wall”, which will let you hear what’s goes on on the other side of the wall:

Props to therawfeed.com.

This cigarette lighter has three interesting feature: it records video, it records sounds… and to look totally innocent, it makes fire!

Via coolest-gadgets.com.