One cheap test I like to do when with friends is to order a flight of something, have each person taste it in turns, then have one person shuffle the glasses ar

One cheap test I like to do when with friends is to order a flight of something, have each person taste it in turns, then have one person shuffle the glasses around while the others aren't watching, recording how they were shuffled (if you want everyone to participate, just have a second person do a second shuffle). It's then everybody's job to taste again and see if they can put the glasses back in order. So far, nobody I've done this with has performed better than chance with vodka tastings and people barely perform better than chance with red wine tastings, even when they're 3 different varietals. The test tends to come out after at least a few drinks though so most people's palates are at least somewhat compromised.