The only thing I normally take home is pizza. Everything else always seems quite different after it's been shoved in a styrofoam clamshell -- mushy, unappetising. Yuck.
Normally, I order an appetiser and salad instead of an entree, or share an entree with my husband, so that there isn't anything left over. Most appetisers, especially in places with pretensions, are like meals in themselves anyway. I hate when I'm given a huge, pig-sized trough of food; I don't feel as though I'm "getting my money's worth," I feel like quantity is more important than quality.
(On an unrelated note: I also loathe those enormous charger-sized plates so many places seem to be into. Yes, it allows the kitchen staff to build Architectural Marvels out of my food -- but then why the **** don't they have bigger tables? Me on one side, A. on the other, two of those wheel-size plates, and we have to start moving the salt and pepper shakers and our drinks onto the window ledge to make room. What IS that about?)