What do the following words have in common?

LOT 

BOY

MEN

ONCE

PAPER

STATE

 

Answer:

 

Each word becomes a new one with the insertion of the letter "U" somewhere in the word:

 

LOUT

BUOY

MENU

OUNCE

PAUPER

STATUE 

 

Credit:

Emily Cox and Henry Rathvon

U OUGHT TO BE IN PICTURES