One Hel of a brain, Joey.
Here's a question that could even flummox the brain of Stephen Fry... who's more intelligent: TOWIE star Joey Essex or professional pouter Helen Flanagan?
It's a matter that (like most matters) stumps Joey Essex.
Chatting to promote the new series of the show, he said: "I was on Celebrity Juice and Helen was with me. Keith Lemon asked me what the name of Jesus's mother was. Instead of writing Katie or Sarah I wrote Zeezus.
"Helen thought I was really stupid. She knew all the valves. (3am: Do you mean a vowel, Joey?) Oh yeah, that's it.
"We should do Mastermind as I'm clever in my own way. Helen is going to be more intelligent."
Einstein would be proud.
The Only Way Is Vegas is on tonight at 10pm on ITV2.