Therewasafarmerwhoraisedwatermelons.Hewasdoingprettywellbuthewasdisturbedbysomelocalkidswhowouldsneakintohiswatermelonpatch（西瓜地）atnightandeathiswatermelons.
Aftersomecarefulthoughthecomesupwithacleverideathathethinkswillscarethekidsawayforsure.Sohemakesupasignandpostsitinthefield.
Thenextdaythekidsshowupandtheyseethissign,whichsays,"Warning,oneofthewatermelonsinthisfieldhasbeeninjectedwithcyanide（一种剧毒物质）."Sothekidsrunoffandmakeuptheirownsign,whichtheypostnexttothesignthatthefarmermade.
Thefarmershowsupthenextdaytolookoverhisfield.Henoticesthatnowatermelonsaremissingbutanewsignnexttohis.Hedrivesovertothesignandtakesalook.
Itsays,"Nowtherearetwo"