Green screen etc.
Red smear memorials. Time travel in tiny, sweaty drug subs. It all comes down to laser machine guns.
Get rich quick slowly schemes.
Cost of moving mass through time. Burying your pilfered gold for pickup vs time traveling it to the present. Inefficient black market time travel business models.
And how you can’t carbon date gold itself.
Sicilian grandmas. Skyrim health potions and time travel interest-compounding. Better investment plans:
Ugly self-driving cars. Greebles. Glue some crap to some crap and bam, you’re in the future.
Time loops. “The same matter can’t occupy the same space at the same time.” The indistinguishability of atoms of the same isotope. Quantum word soup. “Touching” by neutron star. The grandfather paradox where you bang your grandma. Ted Chiang anti-time loop deciphering advice. It’s not gay if you don’t touch and as a bonus you also don’t explode in paradox.