Artist Benjamin Grosser created this browser extension that fills the user’s email with a story containing known keywords that government agencies, such as the NSA, have been searching for in the public’s personal emails. This ‘story’ acts as a trap for NSA programs like PRISM and XKeyscore, forcing them to look at nonsense.

Scaremail example
An example of a Scaremail e-mail.

I like this idea as it reveals how trivially these government spying techniques can be counteracted. It also serves to remind people that this survillance is still going on and to be aware that their private email may not be private.