[JoeSixPack1]

I checked three times to see if a moose ate my sister, then I remembered i don’t have a sister.

[ThePythonicCow]

then I remembered i don’t have a sister

Well of course you don't have a sister. The moose ate her.

[ThomasThomas]

“I checked three times to see if a moose ate my sister, then I remembered i don’t have a sister.”

But did you have a sister before you saw the moose?