Men flip levers inside the Hoover Dam control room.

CU employee's hands taking lid off box full of gold jewelry, he picks up handful of jewelry and places it in pan, then he picks up box and pours remaining contents into pan / CU employee's hands picking up jewelry as he examines it / he...

Tubes and roller of machine / men examine small storage building outside a larger industrial building / control room with technicians, engines, large control panels / rear shot man approaches technician seated in control room / MS...

/ stop motion of calendar as months flip / CU of monthly calendar and square clock.

Phenakistoscope c.1833, animated to create an illusion of motion.

Phenakistoscope c.1833, animated to create an illusion of motion.

Tony Jaa does two flips at the 'Beyond The Sea' Los Angeles Premiere at the Cinerama Dome at ArcLight Cinemas in Hollywood, California on November 4, 2004. (Footage by WireImage Video/Getty Images)

Rhona Mitra on the phone, the design, the flip design of the phone, looking forward to using the phone at the Helio Launch Event at Private Residence in Los Angeles, California on May 3, 2006. (Footage by WireImage Video/Getty Images)

skateboard 360 flip wide

/ speed boats race across Lake Wampatuck / CU of individual boat drivers / boats flip on the turn / crowd watches from the river bank using binoculars / CU winner James Howell. 8th Annual Lake Wampatuck Regatta on May 10, 1962 in Hanson,...

SPEECH - Téa Leoni on her family's history with UNICEF, on UNICEF saving more children's lives than any other humanitarian organization, flips the switch to light the snowflake at 2014 Bergdorf Goodman Holiday Window Unveiling & UNICEF...

INTERVIEW: Eric Balfour on being a Nascar fan and watching cars flip, joking about meeting Ricky Bobby, and on Rihanna at the California Speedway's 'Running Wide Open' Hosted by Jeff Gordon and with a performance by Rihanna at NULL in...

Donald Campbell flies across Lake Coniston in speed boat 'Bluebird' trying to break speed record / boat flips over and into the air / boat lands on water surface and explodes, killing Campbell.

A tattooed cook flips steaks in the galley of the USS Nautilus.

CLEAN : Cali’s children show off their jaw dropping salsa skills in show

Miki Dora surfing at State Beach / surfers, crowds at beach / gay men dancing on the sand / man flips off camera <br/>

JoJo and Lil' Flip at the 2004 American Music Awards press room at the Shrine Auditorium in Los Angeles, California on November 14, 2004. (Footage by WireImage Video/Getty Images)

Slow motion wide shot freerunner doing flip as two others stand and watch

Contestants in Slalom race kayak between markers / boats move down West River / boat overturns and other floats backwards / contestant in boat upside down flips right side up and keeps going.

Low angle medium shot freerunner doing back flip on roof w/London Eye in background / London

Tom Meents at World Champion Tom Meents Attempts A Never-Before-Done Front Flip Of His Monster Truck at Met Life Stadium on June 13, 2015 in East Rutherford, NJ.

Record store owner inspects and flips vinyl album in hands at checkout counter

1960s: Man walks into voting booth, closes curtain behind him, flips switches on voting machine. Three boys in suits run down street.