Numerous
I still remember 90% of my lines from The Wind in the Willows production I performed in, aged eleven. "Your carriage awaits..."

I can sing the entire catalogue of backing vocals to Joseph and his Bastard Technicolour Dreamcoat (I was in that over seventeen years ago). Ah-aaah...
"May I return... to the beginning
The light is dimming, and the dream is too
The world and I, we are still waiting
Still masturbating
Any dream will do"

I could tell you the 1994 prices for a Yorkshire Rider child rate from Hyde Park Corner to most places in Leeds. (20p to the Original Oak - The North has its own version of the famous London park: smaller and with more tramps)

I know every step to simian victory in The Secret of Monkey Island off by heart. "Use giant, purple-ribbed dildo with Governor Marley."

Most of the script of series 1 of Red Dwarf (sad, I know).

Least useful of all: most of Book 1 of the Cambridge Latin Course. "Caecilius est in via. Quintus laborat in horto. Ecce! Cerberus est homosexuales."
( Yo 'Ho of Charlie mass-market saucetrepreneur, Sun 3 Jul 2011, 11:02, Reply)