Are there any good uses for beer that has sat in my growler for too long? I usually try to drink all of the beer in my growler over the course of two nights. While the second serving is usually a good bit less stellar than the first it's usually still quite drinkable.

However, because I almost always plan to drink it over two nights, sometimes the second half of the growler gets left a few days longer. After that it's basically undrinkable.

Usually I snag Imperial Stouts, or other high gravity brews (currently I have a Southern Tier Creme Brulee ripening in the fridge :(). 

Is there a good use for this spoiled beer or should I just pour it out? I was wondering if beer bread was a good idea or not.
Supposedly washing your hair with it has some nice effects,
and people have found other creative uses: 
How to make good use of flat, leftover beer from your Christmas party.

However, if it is only a few days old and has been in the fridge, it's unlikely that it's done much more than go completely flat, so any use that doesn't require it to be carbonated would be fitting. -- I'd go for the bread.