Fun with random

My colleague Alex_Ignatov@facebook.com found curious behavior of random():

postgres=# select (select random() as value ) from generate_series(1,10) as k;
       value       
-------------------
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
 0.715956253930926
(10 rows)

Something like

int rnd=5; // This figure is really random. Got it by rolling a die

;-)