Where does one purchase one of those little square things with a picture on it that go on the corner of the envelope?
You get a long bendable thingy.
Chew 5 pieces of gum at once. A huge wad.
Take out of mouth and put on end of long bendable thingy.
Late at night find a big blue box with a door thing that opens.
Stick long bendable thingy with gum on end inside the door and smoosh it down hard.
Pull long bendable thingy out Very Carefully and you should have an envelope attached to wad of gum.
Eureka! A square thing with a picture on it!
*disclaimer for nerds who don’t get it...THIS IS A JOKE!*