Can these two cases cause static charge build up?

[onemilimeter]

Just watched the EEVBLOG #247 video. It's very nice video. However, I still don't quite understand the theory/concept behind ESD... Let's say there are two bags, denoted as Bag-A (which is non-antistatic) and Bag-B (which is antistatic, e.g. the pink bag shown in the video).

(1) If both bags are rubbed together, will charge build up on BOTH bags?
(2) If Bag-A rubs against itself, will charge build up on Bag-A?

Thanks.