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The act of going back in time to change an event but failing to change anything, so you go back in time again to try to change the event but fail again, causing you to go back in time again to try again, looping indefinitely.
Person 1: If you could go back in time to when you were five with all your current knowledge would you?
Person 2: Yeah, I could invest in Bitcoin early! I wouldn't have to work a day in my life!
Person 1: What if your parents didn't believe you? Then you would have to go back in time again.
Person 2: Ohh, you're right. Even if I did go back in time it wouldn't change what happens.
Person 1: It's Sisyphus' Time Machine.
The act of having sex with your wife/girlfriend's younger, but similar looking sister.
Hey man your wife's sister looks just like her. Why don't you hop in the time machine and relive the glory of days past.
(Abstract/noun/adj/slg)- when you've spent so much of your life wasted on whiskey and alcoholic similes, you awaken one day to realize you are now 50 years old and your sweet children have grown to adulthood without your guidance or parental presence. No matter how bad you want to wind back the clock, the time machine has broken, and you are stuck in nightmare land.
Theorizing that one could time travel within his own lifetime, Sam Fukkit stepped into the whiskey time-machine accelerator... and vanished. Oh boy.