Wikipedia claims they’re quite popular.

Same with guest rooms. In my area, almost all “old” houses have a room that is kept neat and tidy but unused until guests come over - basically wasted space specifically reserved for other people not living under that roof. And the boomers here get confused about why newer houses (especially rental appartements) don’t have that oh-so-important feature anymore.

Imagine an entire effing room and everything in it (furniture included) getting the “fine china” treatment and old people being offended that “the youth today” has the audacity to invite guests into the regular boring non-special living room.

On the other hand, “knocked down” and “knocked up” have drastically different meanings, which is a little confusing for foreigners sometimes. =P

You can also make light out of light by powering a lightbulb with solar energy, or create wind out of wind by powering a fan with electricity generated by wind turbines.

Just don’t try to recreate nuclear energy at home, kids.