While it may be a bit late Aussie Joe, a bloke who lives in Mersin, went to the Galatasaray - Ankaragucu match a few weeks ago and has finally posted a report on his own blog ( http://taheny.com/ ).
It is quite a nice read as this was Joe's first time at a football match in Turkey and it is funny to see his reactions to all sorts of things that all of us used to find so strange about Turkish football (well, quite a few of them are still strange to me).
After the final whistle went, to show their disgust at a mediocre performance, a few of the Galatasaray's immature supporters threw objects, including water bottles onto the pitch. I really don't know why some Turkish supporters are so pathetic. To those guys: sucked in! On a slightly related issue: if we had to get rid of our coins prior to entering the stadium (so they could not be used as missiles) why was change given when buying food and drink when inside?
By the way Joe, you should have bought tickets for the away end. Then you could have shouted your heart out and the Ankaragucu supporters would have been blown away.