Disclaimer: I do not own Fullmetal Alchemist.
"Hey Ed wake up! It's time for breakfast."
"I'm coming Winry."
At the kitchen
"You know I hate milk right? So get this drink out of my sight!"
"Relax brother." Calmed Al.
"Besides this is not an average milk. This is chocolate milk. Please drink it."
"Okay Winry but you'll find out why I hate milk." Edward drinks the chocolate milk.
"Is it delicious?"
"Yeah." Edward's stomach is growling.
"Bathroom!" Edward charged to the bathroom.
"What wrong with your brother?"
"Actually my brother always farted loudly after drinking milk. Or as the american's were saying, He's lactose intolorine (Is this spelling correct?).
"No wonder."
And that's why Edward didn't drink milk.
The End