 When the time came to film Jack Sparrow in front of the Kraken's maw, Johnny Depp's stand-in, Scott Sener, was used to experiment with what worked best with the slime at their disposal (which would represent the phlegm of the Kraken).The slime was spattered about him with jets of air.For the actual filming, Depp was spattered with the slime and acted his part without any representation for the Kraken.