Attempts at rolling over

Linc is getting so close to rolling from back to front. He's been doing front to back for so long now that I'm ready for him to do something new. He also started laughing. He doesn't do it when you expect it, like when you are trying to get him to do it. No he laughs at things like, me using a paper cutter, Kenna looking at him, etc. Can't figure the boy out yet.