Mirror Picture Puns

A police officer walks into a tattoo parlor, hoping to get something cool drawn onto his shoulder. He walks up to the artist and shows him a picture of what he wants. In large text on a ribbon it says, "Protect and Serve." Below it, is a picture of a a badge, a pair of handcuffs, and a pistol. The tattoo artist is very good at his job, and says he can get this done in one session, so the officer sits down and the artist gets started. A few hours later, the artist is just finishing up, inking the last details of his service weapon. Once the last line is inked on the trigger, the cop gets up from his chair and looks in the mirror to see his new tattoo. His face twists into a look of shock and terror, pulls out his gun and opens fire onto the tattoo artist, killing him in the process. He gets on his radio, calling for backup, and took a defensive position until a few more cops and the police chief showed to the parlor minutes later. The chief, while examining the scene asks the officer, "What the hell? Why did you shoot this guy?" The cop says, "What did you expect me to do? The guy drew a gun on me!"

If a mirror reflects all light ... Why can't you see yourself when you look at a picture of a mirror?

My parents are currently in the process of selling their house. Mum has been tidying a lot because potential buyers have been coming through to have a look.
On a recent visit, I noticed that some wall pictures which had been hanging in the same places for years had been replaced by mirrors. I asked Mum about this:
Me: What happened to all the pictures?
Mum: I had to put them away
Me: Well what's with all the mirrors then?
Mum: I want people to be able to see themselves in this house