I just discovered in my parents' basement a Sprite can from 1995* and also a Coca-Cola can probably from the same year.
Both cans are unopened and have no visible damage or holes. The Coca-Cola can feels "normal", but the Sprite can is empty!
You can hear in my video that there is no liquid sloshing around in it.
I can't find any way that the soda could have escaped.
We also don't see any mess near where the cans were, but I don't know for certain that the cans stayed in the same place for 25 years, so maybe there could have been a mess of liquid leaked out somewhere else if the cans had been stored somewhere else earlier. But nothing feels sticky or looks like there has been a leak of any kind.
What are possible explanations for how a carbonated drink could disappear from a sealed aluminum can?
*I had kept it as a "collector's item" from when the Houston Rockets won their second championship.
Note: I originally posted to https://physics.stackexchange.com/q/532731/46543 , but the moderators closed the question and said it belonged in Engineering. Also, I followed advice of commenters there and refrigerated the can and then later submerged it in warm water, but as you can see in this video, there were no bubbles revealing any holes!
Also, many people suggested that the can never had liquid in it, but that seems extremely unlikely since neither I nor anyone in my family remember ever encountering any can ever that was sealed but empty.