And it came to pass the third day, which was Pharaoh's birthday, that he made a feast unto all his servants... Genesis 40:20
"Using DNA
from greenhouse-grown plants representing all species and hundreds of
varieties of watermelon, scientists discovered that watermelons most
likely came from wild crop progenitors in 
northeast Africa.
The genetic research is consistent with newly interpreted Egyptian tomb
paintings that suggest the watermelon may have been consumed in the Nile
Valley as a dessert more than 4,000 years ago.
“Today’s watermelon comes from a very small genetic stock and is
highly susceptible to diseases and insect pests, including various
mildews, other fungi, viruses, and nematodes [worms],” Renner said. “So
far, we found variation in three disease resistance genes between the
Kordofan melon and the domesticated watermelon."
“It was the Egyptian tomb paintings that convinced me that the
Egyptians were eating cold watermelon pulp,” Renner said. “Otherwise,
why place those huge fruits on flat trays next to grapes and other sweet
fruits?” SciTechDaily
