funny bone

noun
1.
the part of the elbow where the ulnar nerve passes by the internal condyle of the humerus, which when struck causes a peculiar, tingling sensation in the arm and hand; crazy bone.
2.
a sense of humor.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
funny bone
 
n
Also called (US): crazy bone the area near the elbow where the ulnar nerve is close to the surface of the skin: when it is struck, a sharp tingling sensation is experienced along the forearm and hand

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

funny bone fun·ny bone (fŭn'ē)
n.
A point on the elbow where the ulnar nerve runs close to the surface and produces a tingling sensation if knocked against bone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases

funny bone

  1. A point on the elbow where the ulnar nerve runs close to the surface and produces a sharp tingling sensation when knocked against the bone. For example, Ouch! I just banged my funny bone. The expression is a pun on humerus (pronounced the same as humorous), the Latin name for the long bone of the arm. [Early 1800s]

  2. A sense of humor, as in That comedian really tickles my funny bone. This expression is derived from def. 1.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Three new books try to tickle academe's funny bone, with varying degrees of
  success.
It's right next to the funny bone, but it doesn't protrude quite as much.
So open your ears and activate your funny bone with this hilarious, practical,
  and playfully illustrated reference.
Some videos tugged at the heartstrings, others tickled the funny bone, but all
  conveyed an important message about service.
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