Another classic:
Twr: ABCD say your height?
ABCD: Your height!
Twr: ABCD say your heading?
ABCD: Your heading!
Twr: ABCD say IFR plan cancelled
ABCD: FL60, heading 200, ABCD
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And another...
Twr: EFGH, Say your height and position?
EFGH: 6'2" and in the cockpit!