what i liked- homer and bart writing the letter and bart sending it, 'hello, my name is mr burns, i believe you have a letter for me.' 'aw right mr. burns, what's your first name?' 'i don't know', bart giving burns some blood because homer wants to get something from burns, etc.
great episode. it has one of my favorite scenes (homer pretending to be burns and not knowing burns' name) and is a great plot. A+