In the movie, Deckard is shown to have a drink in a bar. The drink seemed to have worms under the glass. Is there a sci-fi explanation for that drink?
I've not seen Blade Runner for a long time, but it could be a nod to Mezcal http://en.wikipedia.org/wiki/Mezcal which can contain moth larvae.
TAFFEY (to the bartender) : Louis, the man's dry. Give him one on the house, huh ?
BARTENDER : Whatcha drinking ?
DECKARD : Smokey, dry.
TAFFEY : You assed about a snake.....
Deckard is suddenly hopeful.
DECKARD : Yeah.....
TAFFEY : Wanna see a snake, huh?
The Bartender puts a weird drink in front of Deckard, tiny worms floating in a viscous liquid.
Deckard takes the drink like he was used to it and swigs.
He drinks Mezcal at the Taffey Lewis' Bar.
For an interesting collection of information about Blade Runner drinks (and glasses) check this page: http://www.brmovie.com/Collect/BR_Col_Glasses.htm