Last year while picking up my daughter from high school gymnastics practice, my daughter commented to some of her teammates that I had claimed I could still do a roundoff/back hand spring/back tuck like I could when I was younger.
The girls along with the coach all started riding me over it so I just had to prove I could still do it.......Well, I did it, but my back hurt for over a month afterwards (of course I never admitted it

)
This past summer, I read a magazine article about some older guys preparing to compete at the AMA amatuer national motocross championships and I started telling myself that now that I am 40, I should buy a new 450 and have at it again in the 40+ class (A week or two on the bike and I would be just as fast as I was back in the day

). Thankfully my wife shot my "fantasy" down before I could plop down the cash on a new bike!
At least once a month I find myself lusting for another German car in need of some TLC. I always seem to be able to come up with some kind reasoning/justification for the purchase, but once again, the wife "usually" is able to snap me out of my dream.