Louie lives next door to Robbie. Robbie had contracted with My Painters to paint his house. Robbie's house is in good shape, but his wife would prefer they change colors even though the house does not need painting. Louie's house needs painting very badly but he is unemployed and disabled and cannot afford to hire someone to do the painting. When the painters show up, they don't look see an address but assume it is Louie's house that they are supposed to paint. Louie sees the painters at work but remains in his home and says nothing. When they are finished, My Painters knock on the door and hand Louie a bill for painting his house. What is Louie's responsibility for payment?