So I looked it up and found an entry in wikipedia. Is everything is wikipedia? Swizzle Stick was invented in 1933 as a way to get olives out of a martini without getting wet fingers. Necessity really is the mother of invention.
When most people think of swizzle sticks they probably have an image of those cheap plastic things most popular in the 60's and 70's. These days there are plenty of cool glass and acrylics ones and there is even a store called The Swizzle Stick Store. I know someone who would love those penguins but would never pay the price. (Hi Susan!) I think the mix sets would be more fun and might help people know whose glass belongs to whom. I have these fruit acrylic ones. I am not sure where I got them. Now I just need to have a party. (The set includes 12, 4 of each though I think I am missing one of the grapes.)
I should also note that I love google. When I googled swizzle stick, I found some cool sites, especially if you love drinking. Like this Giant Extremely Large Flask that holds 64 oz!