Legal "trick" plays?

[SC Ump]

Yeah, I think we've discussed these all in the past, but I just wanted to double check myself.

SIT 1: On try, after the RFP, A1 yells to team, "Hold up." Then yells as moving toward the sideline, "Coach, let me get the kicking tee." As B relaxes, A snaps the ball to A2.

SIT 2: On play, A1 says loudly to snapper, "We've got the wrong ball." Then snapper hands the ball to A1, via a legal but different snap. A1 walks to the sideline with ball and then turns up field for a long run.

SIT3: With 30 seconds in the first half, A coach yells, "Take a knee." In (a) A1 responds, "Take a knee! Take a knee!" Or in (b) A1 does not respond to coach. In either case, A1 does a little dip, but never touches his knee to the ground but instead stays standing and throws for a long pass.

Rulings for FED?