It all started with my niece's Pink Party...
Then a G.I. Joe Party for my older brother. We're mature people, I promise...
A Rockband Party for my Dad...
A Nerd Party for my 18th Birthday...
And a Disco Dance with 70's attire!
So as you can see, I am a full supporter of themed parties. And don't think that grown adults won't get into it! As long as you've done your planning to make sure it'll be fun - people will dress up and get into the theme more than you'd think!