[SoFloFreeper]

Number of times that has actually happened in a major league game?

[RPTMS]

I’ll take a guess: the pitcher and the catcher.

[america-rules]

The Pitcher!

[hole_n_one]

BONUS--Which fielder(s) get credited with the 3 outs?

You wanna take a crack at this one?

[CommerceComet]

I would give the put outs to God. For all those things to happen on one play, it must be classified as an act of God.

[latina4dubya]

The defensive player closest to the play gets credited for all three outs though he never touched the ball.

closest to which play? the third and final play?

[right way right]

Short stop for not cluing last out player to look up being that he is the player who probably would be closest to where I am assuming the ball is falling by your discription. Second baseman is going to stick to his position.
Makes the most sense to me.
I’m not to proud to stick my neck out and get it chopped.

[hole_n_one]

Triple Play without defense touching the ball.........

Since the pitcher (defensive player) had to make a pitch to homeplate in order for the pop-up to occur, the entire premise of your absurd scenario is invalid.

[WILLIALAL]

I think once an umpire calls an infield fly rule all further play is suspended and all runners have to return to their original bases.

That is why the rule was implemented.