The Difference?

Had a customer in the store today, who wondered if the scorpions we had were poisonous.
Which they're not.
They're venomous. 

And when I corrected him the dude was like "Eh. Poisonous, Venomous. It's the same thing."

No.
No it's not.
Poisonous things are things you injest.
Venomous things are things that bite you/sting you.

Yah.
Not sure the dude liked being corrected.

-Sarnic Dirchi