haha
pilots do this all the time!
it amazes me...they can readback anything i whip out at them...like a long ILS clearance or a climb/turn our of certain altitude clearance...but they can't remember their call sign...i always get a giggle.
"turn right heading 280, maintain 3000 until established, cleared ils rwy 31 approach maintain 170 knots until FORUM, Skywest...uuu....uhmm.....who are we?"
i hear that like once a day lol