Just an all-time Junk Store classic: the "Drinking Bird" has been donated a few times in my tenure, and this time we are fortunate enough to have gotten two different styles within a few days of each other. A vintage, orange "Peace Bird" on the left and the classic top-hat, red-liquid "Drinking Happy Bird" on the right.
These things go by many, many names, but they all look pretty similar and operate on the same principles of heat escaping through evaporation on the wetted felt head, or something like that. You can read all about the thrilling physics behinds this novelty here.
The drinking bird was invented by Miles V. Sullivan in 1945 and patented in 1946. He was a Ph.D. inventor-scientist at Bell Labs in Murray Hill, NJ.
I'll leave you all with this video I found: