Here's one more useful MUNI tip from your friendly folks at Hooray For Anything-

If someone says "excuse me" over and over again, that means "move out of the way of the person who is saying it so they can get out the door."

It does not mean "strike a pose." Nor does it mean "do your best impression of a punk-ass teenager and think it beneath you to move."

And to the old guy whose knee I slammed my bags of groceries on, I apologize. See above.