In the episode "Royal Rubble" (S6, E13) in which Barney is mistaken
for a long lost Arabian prince, in the scene where he is first
introduced to his harem, and they all rush him and Fred, through
the incoherant female tittering in the sound effects, one female
voice can distinctly be heard saying "I'll take a fat Fred!".
Was this possibly a "find-the-hidden-message" contest put on
by the show's producers at the time? It can be clearly heard and
understood.