Another Secret Bonus Question

I decided to have another bonus question this week!

What kind of transportation do the following Chan movies have in common?

Charlie Chan's Secret

Charlie Chan at the Olympics

Charlie Chan in Reno

Charlie Chan at Treasure Island

Charlie Chan in Panama

. . . . . .

Our Halloween link for today is www.castleofspirits.com. It has a whole mess* of goodies!

* "Mess" for those who don't speak Texan/Southern means "a lot!"