Hah! That sounds like a very well loved book
I think I was 17 when I was steered towards Hitchhikers' by the dad of a school friend. He was telling me about the animals in the restaurant at the end of the universe who were genetically modified so that they wanted to be eaten, and I was just so intrigued that I had to read more
The first one's definitely my favourite, but I think the rest are pretty closely tied. Except for Mostly Harmless, which I found a bit depressing. Have you read the Dirk Gently books? I prefer Hitchhikers, but they're still a good read
Well while you revise Red Dwarf, I'll continue my search for the perfect argyle top! I know what I'll be doing on my lunch break today...
I know where my towel is.