WATCH: So far, Twitter's favorite part of the debate happened just before it started

Aaand a moment we weren't anticipating: Bill Clinton shakes hands with Melania

— Josh Lederman (@JoshNBCNews) September 27, 2016

Just before the presidential debate started, the spouses of the candidates were introduced:

A caption required for this photograph please: pic.twitter.com/atpcYTKZsd

— AndrewBuncombe (@AndrewBuncombe) September 27, 2016

Bill Clinton and Melania Trump shake hands ahead of the debate https://t.co/Ax5m1BYVCX #Debates2016 pic.twitter.com/0lj0SXmLdG

— CNN (@CNN) September 27, 2016

Bill Clinton and Melania Trump meet before their spouses take to the stage at #Debates2016 https://t.co/Ew0IeOTFyh

— Sky News (@SkyNews) September 27, 2016

Naturally there wasn’t any snark about Bill Clinton. Kidding!

"Please welcome Melania Trump and former president Bill Clinton."

Overheard: "Are they together now?"

— John McCormack (@McCormackJohn) September 27, 2016

Bill Clinton put a lot of effort into not checking out Melania.

— Dan McLaughlin (@baseballcrank) September 27, 2016

Okay guys, let's try to rise above the Bill/Melania handshake jokes. This is an important…oops, never mind #Debates2016

— Patton Oswalt (@pattonoswalt) September 27, 2016

"Please welcome Melania Trump and former president Bill Clinton."

Overheard: "Are they together now?"

— John McCormack (@McCormackJohn) September 27, 2016

Bill Clinton to Melania: "politics is boring. Want to get out of here? I've kind of seen Hilary accuse a man of lying before" #debatenight

— Mark Critch (@markcritch) September 27, 2016