The villa we stayed at in Italy overlooked some beautiful landscape.  We woke up one morning and it had disappeared.  The clouds had move in to cover the lower lying areas.  It was very pretty to see.

It's there one minute and then it's gone.  If it's not land disappearing behind the clouds then it's important items like my keys and glasses.  They seem to disappear all the time.  I'm forever using the find me app to find my phone!  How about you?  Do you have something that disappears on you?