You meet an old childhood friend by pure chance, she tell you she have a "small" harem in her class, tell a joke about sharing it with you, mayhem ensue. Not a trope, but do it, it's an order.
So you never see those movies where the protagonist is transported in the film he was watching, in the game he was playing, because his TV was malfunctionning and a sudden flash of electricity ? Same with those isekaied in the net, because of VR or computer making light and electricity and magic ?