Every once in a while you hear of someone trying to cash a million dollar bill (or succeeding!). Here are some faux millions from my collection:

The "American" one is engraved and incorporates many security features later added to our currency. It is very high quality. The Canadian million was available at Canadian dollar stores and is poor quality. The German one was in a pack of bulk currency I bought. While WW2 German currency was worthless, a million modern Deutsche marks would be worth a fortune (although the mark was replaced with the euro, DMs can still be redeemed).