I won't try to start new fads or fashions.
If a is the surface density and dS an element of surface, then fadS is the whole charge, and hence afV adS is the expression for the energy of charge of a conductor.
One of the hottest current fads is to buy inexpensive thongs and decorate them yourself.
Vegetarianism and Zen macrobiotics are presented as ' common food fads which may lead to serious problems ' .
Beware some fads that are too mature for very young girls.