I have honestly never heard of such a thing. It sounds wrong, but I suppose many things do.
Actually, on a related note, I'm getting slightly sick of people trying to zhuzh up the prawn cocktail. It's fine if you want to eat a prawn cocktail, ffs! You don't need to deconstruct the ****ing thing in order to make it OK. Prawns, lettuce, pink gloop - bit of bread and butter - lovely. Stop ****ing about with it.
That's another thing - prawns with their shells still on. No meal is improved by having to **** about dismembering crustacea. So if I order a seafood pasta or risotto, please have the ****ing decency to shell the ****ing prawns rather than asking me to dig my fingers into my dinner to do it. I know you think it looks good and I know I'm apparently supposed to be impressed because the prawn is entire rather than being - say - easily edible, but just stop it, ffs.