I am currently drinking a nightcap of 1 part liqueur to 2 parts spirit, pretty common for me. Good way to enjoy a variety of nice liqueurs, which are otherwise too sweet for me.
The spirit is just some average french brandy, nothing special. The liqueur is a bottle I got during a cleanout of somebody's apartment when they were moving to a retirement home hosted by a buy nothing-like group (not buy nothing, there's drama with the local group that's too much to go into). Lochan Ora, a scotch based liqueur. Honey and herbs, think Benedictine but with a smoky scotch base. Quite wonderful, really. I've been sipping at it, and decided to google it to see who carried it. Turns out, it's discontinued and people pay outrageous prices (up to thousands of dollars) for unopened or even partial bottles.
So, turns out that my Sunday nightcap (and anything I put this stuff in) is one of the most valuable drinks I've ever had. I won't be selling, but won't be taking this stuff for granted, either.