A man goes to see a psychiatrist because he's convinced he's invisible. The psychiatrist listens to his concerns and says, "I'm sorry to tell you this, but you are invisible."
The man is shocked and asks, "How did this happen?!"
The psychiatrist replies, "Well, it looks like you've been invisible for quite some time now. The good news is, it's not a permanent condition. We just need to work on bringing you back to visibility."
The man is relieved and asks, "What do I need to do?"
The psychiatrist says, "Well, it's going to take some time and effort, but we can start by having you come in for regular therapy sessions to address the underlying issues that may have caused you to become invisible in the first place."
The man nods and agrees to start therapy, but then stops and asks, "Wait a minute, if I'm invisible, how did you see me to know that I was invisible?"
The psychiatrist chuckles and replies, "Ah, you caught me! I just wanted to see if you had a sense of humor. Looks like we've found the first step in bringing you back to visibility – a good laugh!"