scrub
v.— «Youtuber Doomblake has done an hilarious job of remixing a the little sequence in Empire Strikes Back where Vader is sitting in his clamshell commander’s chair, scrubbing different shots back and forth with great precision to produce the effect that Vader is sarcastically opening and shutting the clamshell every time his subordinate opens his mouth.» —“Darth Smartass, hilarious video remix from Empire Strikes Back” by Cory Doctorow Boing Boing Aug. 3, 2006. (source: Double-Tongued Dictionary)