Turn up speakers and dance!

Time for a happy post.

 This is an iconic scene from the comedy Ferris Bueller's day off.

Turn up speakers and try not to dance.

.....

So how was it filmed?

Y Entertainment has details.

the parade scene was shot over two weekends — first at an actual parade, but the second merely as a start-from-scratch, on-location film shoot that required hundreds of extras.  

more trivia about the iconic scene here at Ranker:

The parade scene was filmed at Chicago's annual Von Steuben Day parade. Von Steuben Day is a German-American holiday honoring Baron Friedrich von Steuben. Von Steuben was a Prussian general who lent his aid to George Washington during the Revolutionary War....

 

... The second day of filming continued a week after the actual parade took place. The crew needed a large number of extras to convince audiences it was a full and authentic event rather than an empty movie set. The filmmakers asked radio stations to put out announcements for locals to appear in a John Hughes movie. Around 10,000 people reportedly showed up

and what about the dancing construction workers? That was spontaneous:

Construction workers and window washers can be spotted jamming out to Matthew Broderick's lip-synced rendition of "Twist and Shout." These were not choreographed dancers or extras hired to play a part - instead, they were just people going about their everyday jobs. When they noticed the parade and heard the music, they joined in with everyone else. Hughes asked camera operators to film them alongside the actors and extras.