Chess Rules: Is it illegal to say "check" when there's no check?

In the last seconds of a game--when every second counts--it would confuse the opponent.

Laws of chess:

11.5

It is forbidden to distract or annoy the opponent in any manner whatsoever. This includes unreasonable claims, unreasonable offers of a draw or the introduction of a source of noise into the playing area.

So depending on the position, it could be fine. In a position where the opponent's king is almost checked and, in the dying seconds, you confuse that non-check position for a check position. That doesn't sound "unreasonable" to me.

You would be putting yourself in the hands of the tournament director. If he felt that you were deliberately trying to distract your opponent, he would simply forfeit the game, and score it as a win for your opponent, regardless of the situation on the board.

Do you have so little confidence in your own ability that you feel you need to resort to cheating in order to stand a chance?

Do you have so little confidence in other individuals that you assume they have the absolute worst intentions?

What part of my paragraph implied cheating? I used the word "confuse" without quotation marks and used a reasonable scenario (dying seconds) where a mistake was likely.

People don't normally plan out their "mistakes" in advance, and check to see whether or not a suitable loop-hole exists in the rules.

Just sayin'.

I plan out my mistakes whenever possible. Not just in chess, but every day life. Whether it's driving down the road, making dinner, or just going for a walk. I usually will look at things like the area of the ditch on the side of the road, making sure there is a fire extinguisher near the kitchen, and not walking under broken branches on the walking trail. We all make mistakes, I think it's a good idea to plan for it as much as possible.

Since you're in the business of accusing strangers of having intentions to cheat...

People don't normally have a Tactics rating in the 1400s and an Online Chess rating in the 2100s.

Just sayin'.

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Oh and the reason I brought up the scenario was because I had just seen it happen in a YouTube video (at 9:57):

https://www.youtube.com/watch?v=c1IaWvPthy4

And how many tactics puzzles have I attempted? Half a dozen?

If you think I might be a cheater, report me, and the forum staff will run my games through an engine, checking for matches.

As for "accusing you of cheating"... you asked me what would happen in a certain case of cheating. I answered you. You didn't like my answer, and took it personally. Insecure much?

If you are referring to a scenario where a player unintentionally makes a mistake and you want to know the possible consequences, this has been fully answered in #2. Of course you can be sanctioned for unintentional irregularities in some cases.

That's not what it says. It says "introduction of noise" and saying check is introducing noise whether or not you believe it's check.

Maybe the point to understand is: no one says check in tournament play.

There is nothing in the rules against saying check, the closest being the FIDE "introduction of noise" clause. 

It is not required but not prohibited, but if it annoys your opponent you can be asked to stop announcing check. Also, not only beginners announce check.

"Do you have so little confidence in other individuals that you assume they have the absolute worst intentions? "

I would forgive a false "mate" anouncement, however saying "check" when there is none is really under the minimum knowledge one expects from a player. An unintentional behaviour may nevertheless have consequences that should be addressed (after all, a vast majority of car accidents are unintentional).