This month's cartoon is based on the double meaning of click.
Definitions of Click
Click: In computing, to click means to press a button on a mouse. The word comes from the sound that is made when you click - it makes a clicking sound!:
"When you have chosen the file you want, click on 'Open'."
Click: To go or fit together with ease - to become friendly:
"They clicked from their first meeting."
"My wife and I clicked from the first time we met."
Note: Click can also be used to mean 'to suddenly understand or remember':
"I didn't know how to answer the maths question, then it clicked."
"When she started talking to me, it suddenly clicked where I had met her before."