See No Evil - S2-E1
Donald Mallard: I once had an uncle who drowned in a vat of alcohol once
Agent McGee: I'm sorry to hear that
Donald Mallard: Well he did reportedly climb out the vat 3 times to go to the bathroom.
See No Evil - S2-E1
[Gibbs is drinking a cup of coffee.]
Kate Todd: Gibbs, it's like one hundred degrees in here. How can you drink that stuff?
Leroy Gibbs: It keeps me cool.
Answer: I dont believe it is ever mentioned, but like most pilot episodes the characters are often changed, replaced or even removed in this case.