Groups - HHGTTG

Am currently reading a spanish translation of the hitchhikers guide to the galaxy and had just reached the point where ford tells arthur that:

jumping to hyperspace is unpleasantly like being drunk
whats unpleasant about being drunk, replies arthur
ask a glass of water, is the punchline.

Now obviously theres no pun to be had with borracho and bebido but heres what the translator went with....

Es tan desagradable como estar borracho
¿y qué tiene de desagradable el estar borracho?
pues que luego pides un vaso de agua

well, that later you ask for a glass of water???
have i misunderstood or did he just not get the joke? well if its a dehydration reference, it didnt make me laugh.

heres my attempt at something better:

es como coger un ciego
no me suena mál
a menos que seas el ciego

which is perhaps a little ruder than the original but it is ,at least, a play on the possible meanings for coger and ciego

its like getting drunk
sounds ok to me
unless you are the blind man

etc.