[jcl]

One guy used them to prank his roommate:

http://ghostinfluence.com/the-ultimate-retaliation-pranking-...

(I was kind of disappointed that the "hypertargeted ad" link in the article went to a generic how-to article instead of that post.)

[squeaky-clean]

I didn't even click the link in the article because I was sure it would be this!

[hackathonguy]

Amazing post! Will add to the article.