This is a thought that occured to me on my way to classes today; sharing it for feedback.
Omega appears before you, and after presenting an arbitrary proof that it is, in fact, a completely trustworthy superintelligence of the caliber needed to play these kinds of games, presents you with a choice between two boxes. These boxes do not contain money, they contain information. One box is white and contains a true fact that you do not currently know; the other is black and contains false information that you do not currently believe. Omega advises you that the the true fact is not misleading in any way (ie: not a fact that will cause you to make incorrect assumptions and lower the accuracy of your probability estimates), and is fully supported with enough evidence to both prove to you that it is true, and enable you to independently verify its truth for yourself within a month. The false information is demonstrably false, and is something that you would disbelieve if presented outright, but if you open the box to discover it, a machine inside the box will reprogram your mind such that you will believe it completely, thus leading you to believe other related falsehoods, as you rationalize away discrepancies.
Omega further advises that, within those constraints, the true fact is one that has been optimized to inflict upon you the maximum amount of long-term disutility for a fact in its class, should you now become aware of it, and the false information has been optimized to provide you with the maximum amount of long-term utility for a belief in its class, should you now begin to believe it over the truth. You are required to choose one of the boxes; if you refuse to do so, Omega will kill you outright and try again on another Everett branch. Which box do you choose, and why?
(This example is obviously hypothetical, but for a simple and practical case, consider the use of amnesia-inducing drugs to selectively eliminate traumatic memories; it would be more accurate to still have those memories, taking the time and effort to come to terms with the trauma... but present much greater utility to be without them, and thus without the trauma altogether. Obviously related to the valley of bad rationality, but since there clearly exist most optimal lies and least optimal truths, it'd be useful to know which categories of facts are generally hazardous, and whether or not there are categories of lies which are generally helpful.)
Ok, after actually thinking about this for 5 minutes, it's ludicrously obviously that the falsehood is the correct choice, and it's downright scary how long it took me to realize this and how many in the comments seems to still not realize it.
Some tools falsehoods have for not being so bad:
sheer chaos theoretical outcome pumping. aka "you bash your face into the keyboard randomly believing a pie will appear and it programs a friendly AI" or the lottery example mentioned in other comments.
any damage is bonded by being able to be obviously insane enough that it wont spread, or even cause you to commit suicide you don't believe it very long if you really think believing any falsehood is THAT bad.
even if you ONLY value the truth, it could give you "all the statements in this list are true:" followed by a list of 99 true statements you are currently wrong about, and one inconsequential false one.
Some tools truths have for being bad:
sheer chaos theoretical outcome pumping. aka "you run to the computer to type in the code for the FAI you just learnt, but fall down some stairs and die, and the wind currents cause a tornado that kills Eliezer and then runs through a scrapyard assembling a maximally malevolent UFAI"
perceptual basilisks, aka "what Cthulhu face looks like"
Roko-type basilisks
borderline lies-by-commission/not mentioning side effects. "The free energy device does work, but also happens to make the sun blow up"
Note that both these lists are long enough, and the items unconnected enough, that there almost certainly many more points each at least as good as these that I haven't though of, and that both the lie and the true that likely to be using ALL these tools at the same time, in much more powerful ways than we can think of.