I'd pretend to send them into space, and show them a CGI-rendered flat Earth to 'prove' their theory. Much more fun.
It could be on the back of 4 elephants which are in turn on the back of a turtle. Get them back to earth and invite them on to loads of talk shows to tell everyone what they saw.
@AlexD started
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I'd pretend to send them into space, and show them a CGI-rendered flat Earth to 'prove' their theory. Much more fun.