Because he was Snowden...
Her mother leaves.
A: Leave it in the cow.
Because they're not used to getting Snowden. (I'll see myself out)
He was Snowden.
God's punishing you for waiting until the flight home to buy your wife a gift.
Edward Snowed In
because he's snowed in.
Because he was Snowd en! (according to my friends this joke has been around for awhile, but I hadn't seen it yet, and wanted to share the goof)