We're planning a cocktail party, having had a blast last year mixing up retro and new drinks for a bunch of people. (A good night for the taxi trade, that one.)
One of the problems I have is that even though I have several cocktail shakers, the result of several gifts over the years, it's really easy to go through them, especially when you're mixing up different recipes. Starting off with a cold shaker is key, so having a bunch would be handy through the night.
I saw this video from America's Test Kitchen, and I've taken notes.