Today I came across an ad on this question on SO: How to Replicate Vlookup in VBA (I don't expect it to stay very long).
There was a community promotion ad on the right hand side of the site, I think for one of our English sites. It had a sentence that I only partially remember:
Idiom ... poor or even poorer
I found it interesting, so I clicked that ad. Which caused a new instance of SO to open within the ad space. Unfortunately I failed to take a screenshot. I've been refreshing the page like crazy, but can't get the ad to appear again.