This took place back on a hot summer day of 2000 at ORD. Just after a storm has passed through the area. Traffic backed up everywhere on the ground. We were number 6 for takeoff on 27L.

Tower: Mexicana 809, can you take 27L instead of 22L.
Mexicana 809: Yes we can.
Tower: Great. Mexicana 809. Taxi D3, M, M6 in front of American 757.
Mexicana 809: Roger, D3, M, M6 in front of American 757.

after 30 seconds....
Tower: (shouting) Mexicana 809, STOP. D3, M, M6.
Mexicana 809: Roger, D3, M, M6. Mexicana 809.

after 20 seconds....
Tower: (really shouting) Everyone for 22L, 27L, STOP WHERE YOU ARE.
Mexicana 809, can you taxi to the end of the runway without hitting
anyone?
Mexicana 809: Roger, we will try.