I do the same thing all the time! It is always worse when I am under stress, feeling strong negative emotions, or distracted by my own thoughts. My husband says he always knows when I'm having problems with stress or am upset because my forgetfulness gets worse! I hate being like this and feel so embarrassed every time I do something like you mentioned. I have a habit of being inside my head so much that I am not focused on the present and what is going on right in front of me. It's something I need to constantly work on.