One of the things that was REALLY drummed into us when I took my Open Water Diver course was that you don't interfere with the wildlife. This little nurse shark however seemed to genuinely like human contact. The Dive Master would put her hand down, and the shark would swim forward and rest its head in the Dive Master's hand.
TCI135Scuba DivingTurks Caicos Explorer II
From Turks and Caicos 2014