Took me a little while to find it, but here it is. (Had plenty of time to look, since the Daytona 500 was rained out - damn.)
2009 Play Situations Bulletin 2, Play 1.
1. Third and five at the B-30. Team B has no timeouts remaining. The game clock is running as Team A breaks the huddle and settles into a formation with several receivers split wide.
Linebacker B57, confused by the offensive formation, requests a timeout from the Head
Linesman. The Head Linesman erroneously signals timeout and grants the request.
RULING: There is no foul by Team B. The play clock is reset to 25 seconds, and as soon as
possible the referee signals to start both the play clock and the game clock. (3-3-1-b)
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Yeah, they may get some benefit by our error, but this bulletin makes the procedure clear. We just have to be better than to make that error.