It's the first of Adar!

Which means it is time to dust off some old Jewish jokes!
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During his school holidays, 17 year-old Avrohom decides to take a temporary job as a delivery boy for Minky’s Restaurant. One evening he delivers a meal to Bernie’s house. He hands over the meal and Bernie pays the bill. Then Bernie looks at Avrohom for a few seconds and somewhat begrudgingly says, "I suppose you also want me to give you a tip?"

Avrohom doesn’t answer immediately, but looks at Bernie for a few seconds before replying. "Yes, sir, that would be most appreciated, especially as the guy who normally delivers to this area told me that I shouldn’t expect much from you. He said I should be thankful if I got 10p."

"Well," says Bernie, "just to prove your friend wrong, here’s £2 for your efforts."

"Thank you very much," says Avrohom. "This will go into the fund I’m building up to pay for my future education."

"Really?" says Bernie. "So what are you going to study?"

"Applied Psychology," replies Avrohom.