What is the coolest trick you’ve taught your dog?

I am interested in + want to get some inspiration on some really cool or useful tricks y’all taught your pups? Mine is almost 6mo and loves learning new tricks and I am running out of ideas haha.

My recent addition and honestly the most useful thing he’s learned is to close the backyard door after he comes back into the house. Before I had to get up and go close it, so the cold isn’t coming in. Now I just tell him to do it while sitting on the couch / doing whatever I am doing. He loves it!