Regarding One Piece...
My mom's staff had a One Piece themed wedding.
Instead of having their bows in front of a priest or whatever, they signed Ruffy's hat.
The also had a presentation about how they grew up, how they met etc, and it all had One Piece slides here and there.
not to mention the treasure hunt and Ruffy and Nami wedding cake.
One Piece is fine, but the wedding was tacky...