Rest assured, this really did happen.
Mooney Pilot (in a holding pattern): Request the GPS 35 approach.
Approach: Mooney ----U, expect vectors for the GPS 35 approach.
*A few minutes and some vectors go by*
Approach: Mooney ----U, 4 miles from INAGY, cross INAGY at 3700, cleared for the GPS 17 approach.
*Slightly longer than normal pause*
Mooney Pilot: Approach, there is a new GPS 35 approach, INAGY is the IAWP for the old approach.
Approach: The new approach doesn't take effect until the 12th.
*Very small pause*
Mooney Pilot: Today is the 12th.
*Extremely long silence*
Approach: (Laughter in background) Mooney ----U proceed direct to whatever the new IAWP is, cleared for the GPS 35 approach.