Sister picked this one first:

“Turn out all the lights and light all the candles we can find.”

I actually meant for it to say “light all the candles and then turn out the lights” but Sister, ever the literal one, insisted we do it in the order specified.  So we stumbled around the house lighting match after match in search of candles.    It did make the task more challenging to be sure. We even went upstairs to Grandma’s.