Does any alcohol get stronger with time?

Question

Is there any alcohol that gets stronger in percentage the longer it sits unopened?

Answer 1

I like Sleepybbs answer. It could only happen if fermentation were able to continue in the bottle.  That would be really hard to control and could make for some rank drinks. You also probably couldn't keep a cap on it because it would give off CO2 and pop the cork.

Answer 2

There are very few alcohols that will actually get stronger when bottle aged.

Many beers and wines will change, deepen and develop more character with bottle aging, but the alcohol content tends to stay the same.

Spirits (hard alcohol) will not change at all once bottled.