Of all of the magical and mystical things in the Harry Potter universe, child-me always wished I had a Time Turner. As silly as it may have been, a Time Turner truly is the most pragmatic invention at Hogwarts and there's nothing you can do to change my mind. Sure, it's practical to pocket a vile of liquid luck, it would be pretty cool to drive a flying car, and Quidditch in real life would be immeasurably entertaining, for me, it's the Time Turner that stole my heart. You can be in two places at once! Naturally, most of us would never use it like Hermione did, taking more classes than our schedule allowed (nerd), but imagine the possibilities?
You could stroll through the Forbidden Forest, while taking beach excursions with the Weasley's. You could drink butterbeer in a wintery snowscape, while simultaneously flying a griffin through the night sky with your best friend. Arguably, the Time Turner was wasted on Hermione, but I digress. You're here to enjoy an infinity-bag of Harry Potter memes to scroll while you enjoy your morning cup of polyjuice potion (to disguise yourself as a happy, helpful member of the workforce). So enjoy this smorgasbord of Potterness that'll stupefy muggles on site.