I have refrained from publishing this picture for a while because I have been trying to find out who the artist is. The mural can be seen in a second story window frame opposite the wave and flegm mural featured a while back.
The witty picture looks rather old and appears to pre-date quite a lot of the other works in the area. I really should be able to find out who painted it, because it is signed, either MN or MAN. If anyone knows, please let me know and I will update this post. (UPDATE, The mural is by Dan)