I made a D&D joke, because in D&D almost every action say, trying to pickpocket someone, jump across a hole, etc. etc. etc. all have a set DC level the higher up the harder it is ... to determine if you successfully complete the action or fail you role a D20 (20 sided dice) and then add that number to either your save or your skill level associated with that action IE in this case it'd probably be bluff ... to you know seduce some narwhals...
^ Has just obtained the D&D edition of the crab of inf. wisdom
< Just made very very old reference to something on the internet from long long ago