My daughter usually speaks pretty clearly. Granted she has a few speech impediments that are typical for a 3-year-old:
Negs = Legs
Spwaenet = Bracelet
But in general, she is relatively easily understood.
... until she's on the verge of tears.
This morning, she woke up crying, and when I went into check on her, she said (with crystal clarity): "I want sdfalkmweoinoasd."
Me: "What do you want?"
Her: "I want qoinwoefmzxedn."
Me: "I'm sorry, sweetheart. I don't know what you're saying."
Why is it that tears automatically make kids tongue tied?