This big hand spanking my ass relates to how Antwerp was supposedly named. According to folklore the city got its name from a legend involving a mythical giant that lived near the river
Scheldt, taking a toll from those crossing the river. On refusal, the giant severed one of their hands and threw it into the Scheldt. Eventually, the giant was slain by a young hero who cut off the giant's hand and threw it into the river. Hence the name
Antwerpen from Dutch
"hand werpen" (hand-throwing). So there you are, fascinating, and I thought it was just there for semi-amusing photos ;)