You can create a block with pretty much any skill as long as you can justify it.
Yeah, but its pretty hard to justify your pleading to the Shagnasty to not eat you. Its what they do. Plus there are similar stunts that let you broaden how easy it is to block with a skill. (Such as devout words under conviction.) More to the point its a social skill it normally
This has got me thinking of making a whole line of stunts for doing stuff with rapport. Only appropriate for a slightly silly game.
Banter: You may use rapport to maneuver placing aspects on people such as confused, listening to [character] or distracted.
Extreme Banter: Perform a block in a physical conflict. By making assorted comments and talking. This can either be a block against one person performing any actions, or a block against attacking you and close allies near you.
Inane Banter: You may go so far with your banter as to (when affecting one person) act as a grapple! You actually manage to inflict brain damage by making utterly absurd comments directed at one person. (This is the silliest, you may wish to change it to just social damage.)
Witty Banter: When in combat, any blocks using extreme banter directed people who would wish to harm you is at +2.
Quick Banter: You may defend from attacks with rapport by bantering with your targets.