Specificity 101

Heard on Philadelphia Approach:

Duke 1234: Philly Approach, we're gonna begin our VFR descent for the field.

Controller: Duke 1234, say altitude descending to.

Duke 1234: We're descending for the field.

Controller: Roger, Duke 1234, say altitude descending to.

Duke 1234: Well, the field elevation is 78 feet, so ... hopefully, we won't be going below that.

Controller: Squak 1200, radar services terminated.