An Irishman went for an interview with one of the major blue chip computer companies. When the interview was over the interviewer told him that all applicants had to complete a test. The interviewer took a piece of paper and drew six vertical lines in pairs of two on the paper and placed it in front of the Irishman.

"Could you please show me a clever way to make this into nine?"

After thinking for a while the Irishman took the pencil and drew a canopy of leaves on top of the three pairs of lines, and handed the paper back to the interviewer.

The interviewer looked at the drawings and said: "But that is not nine!"

"Oh yes it is", said the Irishman with a broad Irish accent, "Tree + Tree + Tree make nine!"

The interviewer handed the paper back to the Irishman and asked him to make it 99.

After thinking for a longer while the Irishman scribbled up and down the trunks and handed the paper back to the interviewer.

The interviewer looked at the drawings and said: "But that is not ninety nine!" "Oh yes it is", said the Irishman, "Dirty tree + dirty tree + dirty tree make ninety nine."

The interviewer was now a bit cheesed off so he decided to do the Irishman once and for all, therefore, he handed the paper back to the Irishman and asked him to make it 100.

After thinking for a considerably longer time the Irishman suddenly grabbed the pencil and drew a little blop on the bottom right hand side of each three and handed the paper back to the interviewer.

The interviewer looked at the drawings and said: "But that is not 100!"

"Oh yes it most certainly is", said the Irishman with a much broader Irish accent,

"Dirty tree and a turd + dirty tree and turd + dirty tree and a turd make 100!!!!!"