One of the most famous cocktails from the 1970s, the Harvey Wallbanger is a Screwdriver (vodka and orange juice served tall over ice) with a float of Galliano...
I made this as per instructed and it was indeed quite a good drink. However it just occurred to me to try getting the herbal element from Yellow Chartreuse as opposed to Galliano Autentico and I feel like the honey-sweetness of the Chatreuse makes a very welcome substitution. (I omitted the sugar syrup as well.)