“What do you call a clock’s signature?”/“It’s John Hanclock.”

A pun about a time signature was posted on Twitter by “jolly dad jokes” on November 28, 2017:
 
Q: What do you call a clock’s signature?
A: It’s John Hanclock.
 
The portmanteau “John Hanclock” is a blend of “John Hancock” and “clock.” “‘What the hell is a time signature?’ ‘It’s when you autograph a clock. A John Hanclock, if you will.’ #groan” was posted on Twitter on June 17, 2013.
   
   
Wikipedia: Time signature
The time signature (also known as meter signature, metre signature, or measure signature) is a notational convention used in Western musical notation to specify how many beats (pulses) are to be contained in each measure (bar) and which note value is equivalent to one beat. In a music score, the time signature appears at the beginning, as a time symbol or stacked numerals, such as Commontime inline.png or 3/4 (read common time and three-four time, respectively), immediately following the key signature or immediately following the clef symbol if the key signature is empty. A mid-score time signature, usually immediately following a barline, indicates a change of meter.
 
Wikipedia: John Hancock
John Hancock (January 23, 1737 [O.S. January 12, 1736] – October 8, 1793) was an American merchant, statesman, and prominent Patriot of the American Revolution. He served as president of the Second Continental Congress and was the first and third Governor of the Commonwealth of Massachusetts. He is remembered for his large and stylish signature on the United States Declaration of Independence, so much so that the term John Hancock has become a synonym in the United States for one’s signature.
     
Twitter
osteo @ wrimo 📚‏
@0steo
“What the hell is a time signature?” “It’s when you autograph a clock. A John Hanclock, if you will.” #groan
4:16 PM - 17 Jun 2013
   
Twitter
Deven Brown‏
@dev_bro
In pretty sure this woman said “I need you to sign your John Hanclock.”
2:46 PM - 7 Dec 2016
 
Twitter
jolly dad jokes‏
@dadtellsjokes
What do you call a clock’s signature?
It’s John Hanclock
3:15 PM - 28 Nov 2017
 
Twitter
Unlimited Virals‏
@UnlimitedVirals
What do you call a clock’s signature?
It’s John Hanclock
3:18 PM - 28 Nov 2017