Watched by your own free will and forced to have in the background by a 4 year old ARE two different things. Some VHS about dinosaurs (not Bigfoot(?)) was on CONTINUOUSLY 12 HOURS PER DAY FOR 6 MONTHS would have to be #1 for me!!
Other wise:
Christmas Story (yet never from beginning to end)
Tora! Tora! Tora!
Midway
Top Gun
Star Wars Episode IV