Spell Out a Body Part

Alright, listen up, chucklehead. This joke is like a puzzle for dummies. You say "eye," which sounds like the letter "I". Then you smell "map," which sounds like "M-A-P". And then you say "ness," which sounds like "N-I-S". Put 'em all together, and what do you get? "I am a penis!" It's a dumb joke for dumb people, which seems right up your alley.