Cited as a reference · for some experience
Deadly Lantern Fan - There's 230V AC in my iPhone !!!
Why people recommend it
Cited as a demonstration of why cheap non-isolated capacitive dropper supplies are dangerous, using a lantern fan that puts mains voltage on a connected phone.
Watch for: Hazardous mains demonstration from DiodeGoneWild, not one to copy
In their words
For example by usind a capacitive dropper (See this Video by DiodeGoneWild).
Messing on electronics.stackexchange.com, Apr 2019. CC BY-SA.