Interesting? I think so. It kinda reminds me of something else we have to deal with...our secret sins that we thought were taken care of already. We often go through life thinking they left, until we encounter a situation where they rear their ugly heads from somewhere deep within us, unbidden and certainly unwelcome.
And yet this is the hope we have : "If we confess our sins, He is faithful and just to forgive us, and to cleanse us from all unrighteousness." (1 John 1:9)
Instead of pretending they aren't there, let's just take some time to confess those forgotten and even unknown sins to our Father, so that we can let freedom reign once more, and experience true forgiveness.