Marvel Thor: Ragnarok Loki Surprise T-Shirt Loki is the God of Mischief and you never know what he has up his sleeve, but you can hope it is the Marvel Thor: Ragnarok Loki Surprise T-Shirt! Thor's brother, Loki, is framed within a green circle with his infamous "Surprise" quote from the film printed above him on this funny Loki shirt.