Men in crop tops.
I feel this always existed.
I remember SillyBandz, I had the cutest light blue hippo! I also remember the non-wholesome bands where each color had a different meaning. If someone ripped it, you'd have to do that certain activity with them.
For me, I liked wearing a mask everywhere! It feels frowned upon in my area to rock one 
Normalize people wearing masks and nothing being off about it.
Planking. Idk why. It was dumb as hell, but at least we would have TikToks of people doing them and getting arrested lol.
Oh my god... HOW DID I FORGET ABOUT VINE? That's my answer, give me Vine back. Also planking would be funny.
SillyBandz are NFTs now? Oh my…
I would like to see the Harlem Shake back. The collaboration between massive groups of people to look completely silly for 15 seconds brought a tear to my eye. :’)
15 seconds of silliness for 2015 sounds about right. At least I think Harlem Shake was 2015.