My child's new word "Die"

Keatkeat has been saying "die" in almost everything we talked about lately.

An ambulanced was driving past our van with its siren on.
Keatkeat:"Oh no, somebody die" he is still not very good at past-tenses
Me:"No, its just a sick person, he may not die."
Keatkeat:"But the ambulance is driving so fast, so dangerous, sure die."

We were at the doorstep of the supermarket. I squart down and looked at my boys with a serious face:"Now, we are going into the supermarket, what must you do?"
Boys:"Keep my hands to myself."
Me:"Good! If not, the uncle in the supermarket will throw us out."
Keatkeat:"Throw us out!" with eyes wide opened. "Is the uncle very strong? He can carry all 3 of us and throw us out together?"
Me:"Mm! So do you want that to happen?"
Keatkeat:"No. If you fall on me I will die!"

Keatkeat was trying to negotiate to skip brushing his teeth.
Keatkeat:"Why Binbin never use toothpaste?"
Me:"Because he still doesn't know how to spit it out. What will happen if he swallow the toothpaste?"
Keatkeat:"He will die!"

In these days its quite hard to find a pet shop that sells birds. Today we were lucky, we saw a pet shop that sells almost 50 over birds. They were cheeping away and the sound caught the attention of my boys.
Keatkeat:"I want to go see birds."
Me:"Ok, so can you touch the bird cage?"
Boys:"No!"
Me:"What will happen if you touch it?"
Keatkeat:"I will die!"
Me:"No! The birds may think that you are a piece of food and they may bite your finger. What will happen when the birds bite your finger?"
Keatkeat:"(yes, you guess it!) I will die!"

Sigh.....