Home intercoms: Shoddy Goods 104

dave thought this was worth mentioning said
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My childhood home (built in 1973) totally had these intercom systems in every bedroom, though I can’t remember ever using them. Possibly for the crappy radio they had before I got my own. How about you, ever had these in your house or seen them in any others? Have anything quirky installed in your place that future residents will wonder about and/or gripe about having to uninstall? (I’m guessing my ‘smart’ thermostats will not be appreciated in the future.) Let’s hear about 'em in this week’s Shoddy Goods chat.