I would say there were a lot more whimsical purchases I did not make and regret than whimsical purchases I did make. Lot of cool things have escaped because I hesitated.
One example is a S&W 586 factory configured to take Millet rings on the rib. Another was a Ruger #1 A SS in .257 Roberts.
Of the whimsical purchases I did make, a good number of those involving used guns turned out badly. Often times it didn't take long to figure out why they were for sale used.
I had better luck with new gun whims.
Tom