Our bedtime routine changed a while back and instead of holding Simon when I sing a good night song to him I set him in the crib, tuck him in and sing to him. The other night I set him down and he popped right up - which he does about half the time - and I did my normal response of ignoring that he is standing and tucking in his animals instead, leaving a Simon-sized space in between them which usually causes him to dive in pretty quickly. This time he ignored my tucking in of Jelly Cat and Chili Dog and scooted to the far corner of the crib, the one closest to the changing table. He started saying something, but he was tired and I was having a hard time making out the word he was saying. After a minute I went over to look at what he was gesturing to and found that one of the screws that holds the crib together was almost all the way out
and he was not gesturing but instead continuing to unscrew it! (It then clicked that he was saying screw.)
I immediately turned on the light and called down to Alan (who luckily was also home). He was making dinner and confused as to to why I was calling him up when I should be about ready to quietly sneak down the stairs. He too was amazed that Simon was unscrewing his crib and went to go find an allen wrench. Simon came out of the now suspect crib and was very excited that he'd caused such a stir. When Alan started tightening the screws, Simon insisted on helping. Together they fixed the crib.
It turns out almost all of the screws were somehow very loose. Simon for over a year has been laying on his back with his feet in the air and letting them fall on to the crib sides, or kicking the crib sides or pushing on them. We think with that constant motion he just was slowly loosening the screws until he could get his little fingers in there to finish the job. Instead of climbing out, our son was going to just let the crib fall down around him. Very Shawshank.
All is safe now and we will be checking the screws regularly from here on out. Important parenting lesson - learned!