Not had a corn escape yet.. after reading about their houdini behaviour before getting my first corns I decided to make everything as escape proof as possible
I have had one of my leopard geckos get out though... we found him 8ft up a wall 4 days later (and they say Leos don't like to climb, heh).
We've had the iguanas escape before too... 'bout 3 weeks ago was the last time. Annie (5ft female) we got back after about 11 days... Skittles (almost 5ft male) is still at large.. but all the neighbours know where we live if they see a 5ft lizard roaming around the neithbourhood