Go to November 2020, take note of who won the 2020 US presidential election, then go back to October 2016 (before the 2016 election) and post the results.

Also, go back in time to ancient Sumeria to witness this:

Going back in time 2 hours to enter an all-you-can-eat restaurant before it was busy.

Lamest possible use for a time machine.....

Supposedly 'save' children by condemning them to a permanent time loop so they can never grow up, and if they ever do want to grow up, they die!

You put your coffee in it, push the start button and then realize it is not your microwave

Careful you don't know what might change. What if, as a result of your tampering with the timeline in the Jurassic period, Trump gets elected president??

Go forward in time to see if Ted Williams head ever got a successful transplant onto a donor body. If not, kinda hoping for Futurama-esque heads in jars.

You don't need to a time machine to eat a dinosaur. Chances are, you already ate a dinosaur today (e.g. chicken, turkey, duck, etc.).

What's a little necro between past and future versions of oneself? =D

On-topic: traveling forward a century or two to try to borrow small amounts of money off strangers, just so you'll never have to pay them back.

Going back in time to send an e-mail or birthday card so the recipient won't know that you actually forgot about it until a couple weeks after you should've sent it.

That is NOT a lame use! That is a GREAT use!

Dude, I just realized you're the same person as the guy with the avatar of a guy wearing fake antlers on his head.

LOL
That must be as embarrassing as when I realized that all those ZFRs with the same username and gold-bar avatar, but each from a different country, were actually the same user. =D

Going back in time so I can watch myself masturbate. And jerk off to it.

Go back in time to wipe my ass more properly.