text: April Fool's pranks are meant to be a bit of light-hearted fun, intended to trigger smiles of embarrassment. But one grandfather unexpectedly reduced his grandchildren to floods of tears yesterday with his practical joke. Randy Johnston, 68, from Dallas, Texas, decided to leave two 'fake poops' on his granddaughters' beds. His son then went about filming the moment of discovery. But footage shows that the prank turned out to be decidedly disastrous, with Randy's six-year-old granddaughter Porter getting red-faced and dramatically crying in horror. Scroll down for video . Caught on camera: Randy Johnston, 68, from Dallas, Texas, decided to leave two 'fake poops' on his granddaughters' beds - His then went about filming the moment of discovery . Waterworks: But footage shows that the prank turned out to be decidedly disastrous, with his six-year-old granddaughter Porter getting red-faced and dramatically crying in horror . 'Oh no! Duncan, he pooped on my bed!' Porter wails, referencing her pet dog. Her father immediately tries to put a stop to the waterworks. 'Honey, honey, wait. It's not real poop. Look, it's pretend. Papa got you... April Fool's, papa did this. It's pretend, he got you!' the cameraman says. He then tells Porter to smile because he's filming and doesn't want to see her sad. 'Oh honey, smile!' he encourages. Not happy: 'Oh no! Duncan, he pooped on my bed!' Porter wails, referencing her pet dog . Don't be a party pooper: The cameraman tells Porter to smile because he doesn't want to see her sad . Prankster: Randy's April Fool's day trick turn a tearful turn this year . Randy, an attorney, told Daily Mail Online that he staged the prank in revenge for one his granddaughters pulled on him earlier in the day. Porter and her younger sister Reagan, aged three, filled there grandfather’s office with dozens of stuffed animals and dolls so his desk was barely visible. Apparently the youngsters' father is a big practical joker. And by the looks of their April Fool's antics, it looks like Porter and Reagan are set to inherit the 'funnyman' trait. Let's just hope they learn to smile when the shoe's on the other foot. What a mess: Randy, who runs a law firm, told Daily Mail Online that he staged the prank in revenge for one his granddaughters pulled on him earlier in the day . Up to no good: Porter and her younger sister Reagan Johnston, aged three, filled there grandfather’s office with dozens of stuffed animals and dolls so his desk was barely visible .
target: Randy Johnston, 68, from Dallas, Texas, decided to leave two 'fake feces' on his granddaughters' beds .
  His son then went about filming the moment of discovery .
  But footage shows that the prank turned out to be decidedly disastrous, with Randy's six-year-old granddaughter Porter  crying in horror .
  Randy, an attorney, told Daily Mail Online that he staged the prank in revenge for one his granddaughters pulled on him earlier in the day .