Here are a couple of 'object in glass' impossibilities that I got hold of recently:
|Golf Ball In A Jar - Jared Brzenski|
|Spicy - Impossible Bottles|
Now I do know how this is made as I have seen a similar implementation before, so I actually disassembled it just for kicks.
This jar was made and sold by the English site Impossible Bottles, who also have a range of several other incredible (and impossible) creations for sale for some very reasonable prices. Apparently you can even supply them with your own standard glass bottles, and then they will make them more impossible for you. Very clever!