Well… does calling a Lightsaber a LifeSaver for at least a year count?
I have the most frustrating story about this!
When I was like 6 or 7 (Just before I really got into Star Wars) I wanted a Lightsaber toy for Christmas because I thought they looked so cool. When I was composing my Christmas list I wrote on there “Life Saver” because I had misunderstood what it was called. When Christmas day came around instead a cool blue lightsaber I was gifted plenty of Life Savers candies (among other gifts of course!) I was very confused but quickly realized that whatever those laser swords were, they certainly must not have been called Live Savers.