This happened one day in Barcelona, a long time ago:
 
- SN: KLM holding number four, please come up on Unicom
- no response
- SN: KLM holding number three, please come up on Unicom.
- still no response.
- SN: Tower, please tell KLM ahead of us to come up on Unicom.
- KLM: Tower, please tell SABENA that the professionals at KLM Royal Dutch
  Airlines don't use discreet frequencies when they should be monitoring the
  tower.
- SABENA: OK, Tower, but can you please tell the professionals at KLM Royal
  Dutch Airlines that their gear pins are still in place?
- KLM: Tower, KLM 3030 needs to return to gate.

--- D'Bridge 3.99