dum de dum....... Stalactites vs Stalagmites [View all]
They are both spelled similarly with the exception of their 6th and 7th letters. Those letters are very useful in answering the question of which resides where. Stala'ct'ites are on the 'c'eiling or up 't'op. Stala'gm'ites are on the 'g'round as pointy 'm'ounds.
Just wanted to point that out, no particular reason.