I still love the Gravitas running gag. Apparently at some point some writer from a neighbouring civilisation complained that Culture ships, being as enormously powerful as they are, should have names with a little more gravitas. This resulted in a slew of Culture ships with names like "Very Little Gravitas Indeed"; "Experiencing A Significant Gravitas Shortfall"; "Zero Gravitas"; "Stood Far Back When The Gravitas Was Handed Out"; "Gravitas, What Gravitas?"; "Gravitas... Gravitas... No, Don't Help Me, I'll Get It In A Moment"; "Gravitas Free Zone"; "Low Gravitas Warning Signal", and "Absolutely No You-No-What"
Because the Culture are, basically, colossal dicks.