My friend’s wife recently ran into something strange.

Her lingerie and underwear hung on the balcony have been going missing frequently. At first, my friend thought some kind of pervert was stealing them.
But then, one day, my friend suddenly noticed.
Whenever his wife goes upstairs to look for them, the lingerie and underwear can be found smoothly by his wife—and every time she brings them back, right when she gets home, her wife’s face always shows abnormal flushing.
The problem is: my friend’s home is on the first floor—how did those lingerie and underwear overcome gravity and fly upstairs?