This is a really close spot.  I don't think MUMU is ever doing this with worse than AQ, unless you two have history and he's just trying to isolate the short stack who is obv committed.  That's what makes his play look so strong is that he knows he will be playing for the rest of beatnutzz' stack.  If you fold it leaves you with roughly 27 bb's.  If you call and lose you will have 13 bb's.  I think I lean towards a fold here.  Theres a good chance you are dominated and if you lose you will be in shove fold mode.  This spot also depends on where you are at in the tournament.  If it is relatively close to the bubble then I for sure fold because then you still have a decent stack to bully some people and the bubble also more than likely makes their shove ranges smaller.  If not, you could argue getting it in here and if you win you will roughly have 60 bb's.  Interesting spot, would like to hear some TPE pros opinions.

This is close imo given the table scenario you described. I think its a fold though. You have only committed 3bb's to this pot and even though 11bb's shove in CO is not a lot of blinds, he is doing this with no fold equity (strength) and like Coolers said, when they put in most of their stack but leave just a little bit behind, it is a sign of strength most of the time. So really you are fighting for the other 7bb's or so left from other aggro villian (who really still has to have some sort of hand here), while you are praying to win some sort of flip vs original short stack jam. 

Moral of the story, you are risking 17bb's when you have only invested 3bb's and you only have A high at this point.

Last thing. I would start opening smaller in later stages. You can min open this late and get same opening results as 3xing. It allows you to risk less, cbet more often and cheaper, not bloat pots, open more pots, etc.