Search "this is sparta" (without quotes) on Google.com... Kinda NSFW.

Screenshot, unlinked: img214.imageshack.us/img214/874/thisisspartagooglesearcsz4.png

Matt owes me a cookie.

I see something else:
http://img228.imageshack.us/img228/8780/thisisspartaqueryqn5.png

I get the same result as Haochi. Moderate filtering doesn't catch the NSFW result. It can be submitted for removal but will bounce back into search results in 90 days after its been removed.

Get the same as Ionut. (When I turn to the strictest filtering, all image thumbnails are removed.)

Philipp, it seems all image thumbnails are removed when using strict filtering. I tried a couple searches and that was the behavior I witnessed.

With strict filter: no image
with moderate or no filter: I get what Ionut gets but one image is different
this one
http://www.funny-city.gr/templates/content/this-is-sparta/this-is-sparta-7.jpg