Heard this one being told about a conversation at BHX :
Blah Tug - Ground... holding Delta 1, request enter 24, cross 33 to vacate Western Apron...
( or something similar )...
Tower - Blah Tug - Hold Delta 1, contact Tower on 118 decimal 05 ...
Blah Tug - Tower , err Ma'am I don't have that frequency..
Tower - Blah Tug - then I suggest you return to your Stand and get it ...
Blah Tug - Tower, Ma'am - we have a 737 in tow ..
Tower - Blah Tug - I am aware of that - TAKE IT WITH YOU !