I blew Sarah’s mind with this trick. You can screw a mason jar directly on to a blender blade!
From Popular Science:
Way back in 1858, Mr. John Landis Mason, the Scottish farmer who patented this eponymous glass canning jar, had the remarkable foresight to make the thread count of the jar’s neck match of a blender bottom cap. (Actually, it was probably the other way around, given that electric drink mixers, the precursor to the household blender, didn’t come about until 1921.)
This is a great tip, and it’s just in time for slushy summer drink season.