Snake!

My wife came running in from the garden screaming, "A SNAKE, A SNAKE. "

So I quickly went out to have a look, "What's seventeen plus thirty-two? " I shouted at it.

"Forty-nine, " the snake hissed back.

"It's ok, " I shouted to my wife,

Spoiler:

it's not poisonous, it's only an adder. "