Does a sketch set count?  This one sat on Taro 
for ages... I remember seeing it when I first 
saw a couple of episodes of Gatekeepers, 
and being unsurprised that it hadn't sold, since 
I thought the series was fairly lame.  Then, 
weeks later, I was coerced into watching just a 
few more episodes of GK... and I got to 
the first one with Banchou... and my first 
thought was, "S**t, there's absolutely no way 
that sketch is still going to be on Taro"... and 
it was.  ^__^