Rincewind stared into the frothy remnants of his last beer, and then, with extreme care in case the top of… — Terry Pratchett

Rincewind stared into the frothy remnants of his last beer, and then, with extreme care in case the top of his head fell off, leaned down and poured some into a saucer for the Luggage. It was lurking under the table, which was a relief. It usually embarrassed him in bars by sidling up to drinkers and terrorizing them into feeding it crisps.

Source: Wikiquote · CC BY-SA 4.0