Cafeteria Rush

Listen up, you chucklehead! This joke is about a student who's also a cannibal. He ran to the cafeteria 'cause he wanted to eat *before* everyone else... get it? 'Eat ahead' sounds like 'get ahead,' like he's trying to be first. You probably still don't get it because you probably eat paste, so let me know if you need me to ELI5 even more.