Pen with invisible ink

This ingenious device not only allows you to write last minute notes, but to destroy them as well. Use the Pen for messages that will only show up under ultra-violet light. If you are the worried that the baddies will see it, you can shred it instead of eating it.

The pen comes with a message pad and batteries for £4.99 (~$10.00.) We can see this being used with other applications, such as destroying ATM slips or that extra receipt when your partner/spouse didn’t know you took that side trip to McDonalds on the way home from work.