The Tonight Show host invited Zac Efron to play a game of Russian roulette – with eggs – on Monday.
The pair sat across from each other as they chose one egg at a time and smashed them onto the top of their heads, hoping each egg would be boiled rather than raw.
Did Efron's perfectly sculpted hair – and stylish grey suit – escape unscathed? Watch the video above to find out.
"You can kinda tell" if the egg's hard-boiled, the We Are Your Friends star insisted as he shook one in his hand.
"You can't tell," Fallon replied with a smile.
Things got a little messy after that, but we can reveal that one of the men joked that the other had egg on his face, "literally."