Here's a selection of great eBay ads that used to be seen on Google.com a couple of years ago. As you can see there's nothing you can't find on eBay. No matter how fancy was your query, eBay ad just copied it in its template.
5. Dead people, carefully selected by eBay.
4. Brains. Maybe they'll come up with better ads.
3. What would you pay for happiness?
2. For difficult problems that require professional help.
1. Nothing's pure on eBay. Even nuns are for sale.
Also see:
Top 10 funny Google News
Google News Has "Ads By Google"