Wait - before I start what is about to be an EPIC Molly rant on #webdev - do you kids today even KNOW what gopher is? How about a coupler?

No idea about coupler, but I remember using gopher. (But then, I am old.)

Should know the coupler if yer that old, dearie (said in an old lady voice. Oh, wait...) ;-)

Well, I could know it but not remember it's called a coupler—post-chemo brain is a thing ;-)

To answer the actual question (I really do blame chemo brain for that, not even kidding) acoustic couplers were the handset modems.

Oh, those things with the cups you put the old fashioned phone handset in? Yes, I do remember those!