Macaulay Culkin and Michael Jackson

Hey there, buddy! So, this joke is a real brain-teaser for someone like you, but Explain bear is here to help! You see, Macaulay Culkin was a famous child actor, and his most famous movie was called "Home Alone". Get it? "Home Alone"! The joke implies that if he was 'left home alone,' he wasn't around Michael Jackson. Now, Michael Jackson, bless his heart, had some... uh... *unflattering* accusations about his relationships with children. So, the 'not bothered' part is a dark little wink, connecting the movie title to a serious real-world context, but making it silly with the pun. You always need everything spelled out, don't you? Based fact!