Overheard while laying in the guest bedroom

• Overheard while laying in the guest bedroom at Grandparent’s. I was trying to fall alseep.
  
  Grandma singing in her operatic voice: “Beautiful dreamer, wake unto me, Starlight and dewdrops are waiting for thee; Sounds of the rude world, heard in the day, Lull'd by the moonlight have all pass'd away…”
  !!!!GIANT LOOONG LOUD FART!!!!
  Grandma still singing: “…Beautiful dreamer, out on the sea Mermaids are chanting the wild lorelie;”
  Then Grandma stops singing and says: “Dear! Did you just fart?!”
  Grandpa: “Nope”
  Grandma: “Yes you did, I can smell it and it stinks!”
  Grandpa: “No I didn’t!”
  Grandma: “Hrummph.” continues to sing: “...Over the streamlet vapors are borne, Waiting to fade at the bright coming morn. Beautiful dreamer, beam on my heart, E'en as the morn on the streamlet and sea; Then will all clouds of sorrow depart…”
  
  Ok, Were do I start?! First of all who else could it be? Could she have been singing a funnier song? Why would he tell her ‘nope’? Do you have any idea how hard it was not to giggle? And lastly, they must not be aware of what the guests upstairs can hear?! God love ‘em!