My friends are always impressed by the random things I make, but I'm not usually one for party tricks. I do have one friend who loves to ham up the party, and another one who will try and make a bet with you on anything.
While these tricks might be pretty pointless, you can totally use them to ham up the party or win a bet. You'd be surprised at what can surprise and shock a group of grown adults. With these, I'm super impressed!