My accent makes intervocalic and some post-sonorant t's glottal stops--it feels really weird to pronounce the /t/ in "mountain" or "button" (although the ones in "bottle" and, well, "glottal" are alveolar flaps). That's what got me thinking about it--I was writing out that I pronounce it "moun-ain." "Moun'ain" looks like I'm saying it without a stop, since elsewhere in English an apostrophe means dropping sounds. (Note this is for English--in other natural languages I have no trouble parsing apostrophes as glottal stops. What gives me pause is that the apostrophes in so many fantasy stories are written by people who have no experience with languages that AREN'T English, so I wind up trying to apply the English part of my brain to it. For all I studied linguistics, my brain feels there are two languages: English and Foreign. Darn monolingual upbringing.)