Because he was Snowden.
She fell out of the tree.
If you leave yogurt alone for 200 years it'll grow a culture
Because he was Snowden
I'm Snowden!
Russia.
None. In Russia, light bulb changes you.
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)