Seen on Ask Metafilter recently: Why does a sandwich made by someone else always taste better than one you make yourself?
Lots of great responses in the thread; many people feel the way I do about it, which is that when it is true, it's due to TLC and to you being surprised by combinations someone else came up with.
What's your favorite sandwich that you buy? That someone makes for you? That you make for yourself? Tell us in the comments!
(Image of Fry eating a cheese sandwich from The Futurama Point)