The phantom throatwobbler

There have been some strange goings on at CC Towers, with a spate of nuisance calls from a rambling whisperer who, according to an internal email, when asked who is calling, replies: “Throatwobbler Mangrove.”
Apparently, the caller uses the Clifford Chance freephone number, which is reserved for the firm's staff, and on occasions has left voicemails for unsuspecting staff. Clifford Chance staff now have to identify themselves when using the freephone numbers. Very weird.