Andy Arnt, a Software Engineer at Google, made a Google+ post about two Bing Easter Eggs that take shots at Google. For each search search a onebox-like placement displays negative results for both searches.
The first query "more evil than satan himself" returns a result of:
Here is a screenshot of Bing search:
This is of course is the number that is equivalent to a googol, what Google is loosely named after. This exact term was actually a query of controversy back in 1999, when a search was conducted on Google for 'more evil than satan' the Microsoft website showed up as the number one result. Google had debunked the issue by stating that the anchor text to the Microsoft site was simply evil-heavy.
The second query that has an Easter egg is "hiybbprqag" shows
hiybbprqag (orcish) = whiner (common)
The query is in reference to the Bing-copying-Google 'Copygate' scandal of February this year. Google had provided an example of a fabricated word that had a specific set of results in Google that Bing had 'copied.' Bing of course dismissed this by stating that clickstream data would have caused the results.
Here is a screenshot: