Cristiano Ronaldo and Oranges

Listen up, chucklehead! This joke is based on a wordplay. Cristiano Ronaldo, that soccer dude, right? He yells "Siiii!" when he scores. The joke is playing on the fact that oranges have Vitamin C, but it sounds like Vitamin "Siiiiii!" Get it? You probably don't, but whatever. It's not my problem you're dense.