Can you choose to fail a skill check?

[Markov Spiked Chain]

Thinking about my Envoy, which as this Improvisation:

Dispiriting Taunt wrote:

As a standard action, you can taunt an enemy within 60 feet. Attempt an Intimidate check with the same DC as a check to demoralize that enemy (though this isn’t a check to demoralize, so you can’t use abilities that would apply to a demoralization attempt, like the rattling presence expertise talent). If you fail, that enemy is off-target (see page 276) until the end of your next turn. If you succeed, that enemy is instead shaken (see page 277) until the end of your next turn. This is an emotion and fear effect.

Off-target and Shaken stack with each other, so if I have a target Shaken, I'm better off Adding Off-target.

Can I choose to fail the Intimidate check, to get the Off-target effect?

[Andy Brown]

Cheer the enemy on instead of taunting them? I can see that might put them off a bit :)

[rook1138]

depends on how long their current shaken condition is going to last. Sure they stack, but if you shook them last round, and then off-target them this round, then they won't be shaken anymore once your turn is over, only off-target (and shaken is the superior condition).
Now, if you can extend the shaken to be multiple rounds (you can), then it may be worth it to get them shaken for x rounds, and as long as the shaken isn't going to end at the end of your turn, throw on a different condition that stacks, sure.

[Markov Spiked Chain]

I'm thinking about the later Improv where you can taunt as a move action. There's definitely times where I'll want to do both, either because there's only a single enemy, or I got a really good Demoralize that'll last a few rounds.

What I'm not clear on is whether I can choose to fail, if my target is already Shaken, but Off-target would still stack?