Zac Efron recently refused to answer talk show host Conan O'Brien's question about whether he has tried viagra in his life clearly.
'The Awkward Moment' star said that he couldn't confirm or deny it if has ever taken the drug, but claimed that someone he knew did take just a tiny bit of it, the Mirror reported.
When O'Brien asked the former Disney star if the so-called friend was actually him, Efron continued saying that the drug had turned the guy into a horse.
