Hardly any Regensburg visitor misses the monumental painting on the facade of the Goliath House.The mighty patrician castle with its fortified battlements is only a stone's throw away from the Stone Bridge. Since the 13th century it has been the residential and commercial building of powerful patrician families. Around 1573, the then owners had Melchior Bocksberger add a huge exterior fresco of the fight between David and Goliath to the building.On closer inspection of the Bible scene, the attentive visitor will notice a frog on the lower right edge of the picture. This frog is a graffiti by Hans Kranzberg who restored the painting around 1845. The humorous restorer caricatured the retired civil servant Anton von Quentel, who rode past every day on horseback in a green tailcoat and inspired the artist to make this addition.