Judges 16:23 (ESV)

23 Now the lords of the Philistines gathered to offer a great sacrifice to Dagon their god and to rejoice, and they said, “Our god has given Samson our enemy into our hand.”

Dagon is the chief god of the Philistines. He was particularly known as the god of grain. So now at this festival of the grain god, the Philistines are getting their kicks from this destroyer of grain!