What is something you've always wanted to know how to do but could never quite figure it out?

Me, i never could cartwheel or blow bubbles with chewing gum. I still try the chewing gum thing all the time tho, but I cant figure it out

Me and a friend were trying to figure out whether it was possible to drink cyanide but never found out....
I can't pop bubble wrap for some strange reason and also cant blow bubbles with bubblegum

I've always wanted to know how to do summersaults on a trampoline

I've never been able to click my heels in the air, and it annoys the shit out of me.

I have a new one.
I've never been able to do that star trek thing with your fingers so figuring that out would be cool

I have no idea what the star trek thing is Lol

oh thats easy!!!