my wife rented me a convertible corvette for a weekend once for my birthday, that was pretty cool, living in Boston at the time, took it up the New England coast (marblehead,etc)
My in-laws gave me a cool x-mas gift this past year, They paid for a Richard Petty driving school class down in Orlando (WDW), nothing like doing ~130mph in a NASCAR, they paid for me and I paid for my wife to join me.
Worst gift....hmmm don't know....
Any gift at x-mas time from my wife, we always agree not to spend money on each other, would rather spend it on our neices/nephews or other things we need (fixing up the homestead). She always ends up giving me something and I never do, makes me feel crappy....