Not quite PEP8 compliant, but quite nifty:
http://www.cs.princeton.edu/~ynaamad/misc/bf.htm
The program below interprets the follwing string as "Hello World":
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.
(lambda t:(lambda a:(lambda b:(lambda
l,e,s:((lambda(Y,o,N,A,t),a,n:e('v',(Y,o,N,A,t))or[e('v',(lambda(Y,o,N,A,t):({'>':(lambda(Y,o,N,A,t),a,n:(Y,o,N+1,A+1,t)),'<':(lambda(Y,o,N,A,t),a,n:(Y,o,N-1,A+1,t)),'+':(lambda(Y,o,N,A,t),a,n:((Y[:N]+[Y[N]+1]+Y[N+1:],o,N,A+1,t)if
N>=0
else(Y,o[:-N-1]+[o[-N-1]+1]+o[-N:],N,A+1,t))),'-':(lambda(Y,o,N,A,t),a,n:((Y[:N]+[Y[N]-1]+Y[N+1:],o,N,A+1,t)if
N>=0
else(Y,o[:-N-1]+[o[-N-1]-1]+o[-N:],N,A+1,t))),'.':(lambda(Y,o,N,A,t),a,n:__import__('sys').stdout.write(chr(Y[N]
if N>=0 else
o[-N-1]))or(Y,o,N,A+1,t)),',':(lambda(Y,o,N,A,t),a,n:(Y[:N]+[ord(t[0])if
len(t)else -1]+Y[N+1:]if A>=0 else Y,o[:-N-1]+[ord(t[0])if len(t)else
-1]+o[-N:]if A<0 else o,N,A+1,t[1:])),'[':(lambda(Y,o,N,A,t),a,n:(Y,o,N,n[A]+1
if(Y[N]==0 if N>=0 else o[-N-1]==0)else
A+1,t)),']':(lambda(Y,o,N,A,t),a,n:(Y,o,N,n[A]+1 if(Y[N]>=1 if N>=0 else
o[-N-1]>=1)else A+1,t))}[a[A]]((Y+[0]*(9+len(Y)) if A>=len(Y)-5 else
Y,o+[0]*(9+len(o)) if -A>=len(o)-5 else
o,N,A,t),a,n)if A<len(a)else False))(l('v')))for i in s.takewhile(lambda
x:l('v')!=False,s.count())])(([],[],0,0,t),a,dict(e('g',[])or
e('l',[])or[e('l',l('l')+[i])if
a[i]=='['else(e('g',l('g')+[(l('l')[-1],i),(i,l('l')[-1])])or
e('l',l('l')[:-1]))for i in range(len(a))if a[i] in'[]'][:0]or
l('g'))))[:0])(b.__getattribute__,b.__setattr__,__import__('itertools')))(lambda:a)or
None)(filter("<.+[,->]".count,open(__import__('sys').argv[1]).read())))(raw_input())
Regards,
Albert-Jan
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
All right, but apart from the sanitation, the medicine, education, wine, public
order, irrigation, roads, a
fresh water system, and public health, what have the Romans ever done for us?
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