Darragh McManus runs through his favorites:

[I'd not] mind sampling some melange/spice from Frank Herbert's Dune (long life, heightened awareness and possible extrasensory properties, cool blue eyeballs); septus from Iain Banks's Transition (the ability to flit between parallel worlds and inhabit others' bodies); Dylar from Don DeLillo's White Noise (no more fear of death); the various hallucinogens drunk with the old moloko in A Clockwork Orange (a nice quiet horrorshow starring Bog and all his angels); Can-D in Philip K Dick's The Three Stigmata of Palmer Eldritch (allows you to participate in a group hallucination). I also quite like the sound of the Pan Galactic Gargle Blaster in Hitchhikers' Guide to the Galaxy, described as "like having your brains smashed out by a slice of lemon wrapped round a large gold brick". Well, it beats aspirin and sniffing exhaust pipes.

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