Your spine.
They think Cast is spelled with an e.
By Spaghett-e-mail!
About two hours.
Reddit.
By reposting it every week!
Swallow the leader. *This joke has been brought to you by my 8 year old's math homework.*
Buried in the third page of google search results.
A clever joke, but nobody will have Reddit...
Spine
The letter P.
They both contain locked up loonies!
an Envelope EDIT: My deepest Canadian apologies to those who are calling this a riddle. I always took it as a cheesy joke