Theme ideas for a work training?

Question

Every year at work we do the same boring training, we have to use the same material, but we spice it up by having a theme. We try to keep it humorous. Last year we did 80'sand made a fool of ourselves in side-pig-tails and included a Richard Simmons work-out, but it was fun. Any good ideas out there? Our material to cover is about 4 hours long.

Answer 1

Why do you use the same materials?  Why can't this be a self-study?

Please don't make people sit through lame skits and stupid dress ups.  They are adults and would rather get to whatever they need to do than be forced to watch others acting silly.