Trying to think of something funny to put in a movie i'm making?

I'm making a movie i put together of me/my family takin a trip to LA. We went to see the Hoover Dam (famous for the Transformers movie) and Las Vegas. I put in the las vegas section, look it's criss angel levitating above the luxor... haha made you look. What should i put for the hoover dam? I was thinking of putting something with transformers in it.