Tree Surgeon..........
Paddy applying for a job as a tree surgeon is asked lots of technical questions which he answers expertly, he even gives the Latin names for the trees and tells of the cures for the diseases.
The interviewer thinks that Paddy is a real clever so and so and tries to trip him up.
He says, "Right Paddy, which is the front of this tree and which is the back?"
Paddy wanders off round the tree and returns a couple of minutes later and says "This is the front."
The interviewer says, "How do you know that?"
Paddy says, I've just had a pee round the back."