An atom walks into a bar and sits down to order a drink. He looks very dejected because he has received unrelenting insults all day and he has has all he can take.
The bartender notices his demeanor and asks “Hey there friend, what up with you? You seem awfully down” The atom replies “I had such a bad day and to top it all off, I lost an electron!”
The bartender asks him “wow that’s really rough–losing an electron. Are you sure you can’t find your electron anywhere?”