This is one I like. Nothing special, a simple, cheap and apparently a promotional gift, mug. But it has a... history. When I entered in my previous house, about 20 years ago (a friend of mine was living there before me and another common friend before him), I found in a cupboard some plates, glasses and mugs. I used all of them and when I left after 8 years for my new (and current) house, I took them with me.
Now only a couple of plates and this mug still exist, the others have broken during washing e.t.c.
So, when I drink with this one... well, I kind of travel in time...