This is one of those ‘you had to be there’ moments, but I’ll tell you anyway.  A colleague of mine managed to get a fishbone stuck under his fingernail, causing it to go septic.  This sparked a rather raucous conversation about the fish equivalent of Spiderman.    It started out as Sardine Man, with the ability to fit into tight spaces but I thought Mackerel Man had a better ring to it (and theme tune).