Hmm... seltzer "shots" could certainly be a thing. Vodka diluted to 20ish% ABV with water and a touch of sugar syrup, then artificial flavor (and even bright colors), and carb it up. Make up some urban myth about the carbonation speeding up alcohol absorption and the frat boys will go nuts for it. You could even package it in enema bags...
thats the theorizing im talking about - seltzer didnt "NEED" to exist, but it fills style, demand (people who dont like beer), and legal category in many jurisdictions (was listening to a craft brewer from georgia say they need a separate license just to sell spirits at a craft beer bar for one example).
im thinking more like shots called "hard candy" "hard liquid candy" "that are syrupy sweet, 15-20% range" like eating a jellybelly jelly bean or something. an entire range of pseudo-candies ie. sour, lactose infused "creamy" ones. insane quantities of lactose and residual sugar.