Dorothy Barthelson, of North Carolina, let out an ear-splitting scream, shrieked and danced around the room when she learned that her daughter was pregnant (video below).
Ashley and Michael Krauter placed a sonogram in a birthday present for Barthelson's husband, reports the Daily Mail.
As he unwrapped the gift, the Barthelsons were filmed by their son-in-law, Michael.
After Mr. Barthelson read: "Grandpa! Some birthdays are more special than others," his wife began her meltdown with an alarming scream and said: "Oh my gosh, oh my gosh, is it true? It really is true? I'm excited, I'm really excited, I'm so excited."
Mr. Barthelson, who is completely calm, seemed annoyed by his wife's screeching and said: "Dorothy, come on, quit crying."
"Most hilarious family video to date," said Michael.