This German site allows you to do all types of port and security scans.
They tell you just to use it for testing your local pc and that scanning of foreign systems is
as far as possible impossible.

But it is not!

Their scripts do not use your IP as target for the scan but whatever is put into the "X-Forwarded-For" header.
So scanning anything is possible.
Maybe nothing special but nevertheless funny.

tbs

Wow that's pretty bad, you could scan a system for possible vulnerability's, then exploit them, without haveing your own IP showing for the scans ... hmm, that cant really be a good thing for them ...