I had a taste of Schlenkerla Rauchbierschnapps yesterday from the bottle I bought in their Bamberg brewpub last summer.
It's nothing like any of the schnapps I've drunk before. The kick of the spirit is infused with the smokiness of beechwood malt. Like their beer, I suppose you either love it or hate. A bottle of Schlenkerla Rauchmärzen makes for a great chaser with it.