When I was a kid, we used to eat in a restaurant with "puffer" lamps. Inflated fish with light bulbs inside. I don't know how old I was before I started to realize how gross that was.
Hi
OK deep dark secret time - I have (to my shame) got one of these lamps.
12 years ago just after I certified, I went to Cuba diving, and there they where selling these puffer lamps. At the time I thought they were cool and bought one. Over the years I realised that actually it wasn't cool, but quite gross and environmentally scary, so now it is consigned to the back of the garage.
It just shows how impressionable new divers are; my Cuban DM told me they were OK, so I bought one. We have to be very careful how we talk and act around new divers. PADI talks about 'appropriate role modeling' when training DM's, but gives little guidance as to what this really means, so our conscience must guide us. I know better now and teach accordingly
Cheers
Hal