Don't get caught without the coin! It's probably best to order a few... because two is one, one is none, and three would mean you have one to give to a new friend!
2" H, 3.5mm thick
So, where exactly does the “challenge” idea come from?
According to some stories, “the challenge” started after the Second World War in Germany. Americans stationed in Germany began to conduct “pfennig checks,” or checks for thislow-denomination German coin. If you couldn't produce a pfennig when someone else called a check, you had to buy the beers.
The pfennig check later evolved to a unit medallion check, with unit members challenging one another by slamming their medallions down on a bar. Any member who lacked his medallion had to purchase drinks for everyone else who had their coins. Meanwhile, if everyone could present a medallion, the challenger was the one who had to buy the drinks.
The same essentially applies today.
However, instead of firmly placing your challenge coin on the bar to initiate a coin check, you can raise your coin in the air and shout that you’re initiating a check. You could also accidentally initiate a check if you inadvertently drop your challenge coin.
In addition, to succeed in a challenge, you must have your challenge coin within arm’s length from you. If you don’t, well — tough luck.
Now, naturally, you may refuse to buy drinks for everyone if you end up losing the challenge. Note, however, that this is a detestable crime — one that may require you to return your coin to the agency that issued it to you.
And another thing: Challenge coin checks are allowed anytime and anyplace. So, be prepared.