Friends, Lovers, & Lunatics (1989)

Daniel Stern plays artist Mat

The artist Mat being fired from his office job while wearing sunglasses

Mat making a stalkery artwork from an old love letter from his ex-girlfriend.
Here we see him blowing up the letter using a photocopier

Mat the artist in his studio cutting up the photocopies he has made from his ex's letter to make his art

Mat's ex arrives home with her new boyfriend and they discover Mat's artwork in the fridge
(all the food wrapped in her love letter)

Mat's ex girlfriend also discovers he has made a paper sheet for her bed using her old love letter

Friends, Lovers, & Lunatics on IMDB