Self-Interpreting Interpreter
Binary Lambda Calculus, 232 bits (29 bytes)

0101000110100000000101011000000000011110000101111110011110000101110011110000001111000010110110111001111100001111100001011110100111010010110011100001101100001011111000011111000011100110111101111100111101110110000110010001101000011010

See
  http://en.wikipedia.org/wiki/Binary_lambda_calculus#Lambda_encoding
for details