Opened.
Can't go wrong with xkcd.
If a tree falls in the forest and nobody remembers it, who else will you have ice cream with?I second the xkcd suggestion. The two Genie ones seem a bit vague (in particular, the "you can't wish for more wishes" isn't that obvious a rule-patch; seems to me like it's something a smart genie might include in his ruleset from Day One). And I find the xkcd comic funnier than the two real-life (?) signs. Perhaps the only other serious contender is the "Rule one: fix the rules", but it's not as funny as the xkcd one.
I don't think xkcd is an example. The whole "one guard lies, one guard tells the truth" thing is set up to encourage tricky questions, that's the whole point of it. An Obvious Rule Patch closes a loophole while still allowing the intended course of action.
Picture 4 feels most in the spirit of the trope.
Picture 3 feels a bit too much like Wish Plosion for me.
Given the title text, the xkcd isn't an example; that door does nothing useful except act as a honey trap for logicians.
Pic 3 was edited to avoid that trope and Loophole Abuse. We would only use the former link.
And the Alt Text wouldn't be readable if we were to use the xkcd pic...
Clock is set.
I'm good with using picture 4 (edited) if the xkcd one doesn't get consensus.
Clock's up; locking for inactivity/lack of consensus.
The current picture was already challenged in this 2012 thread, and long story short, there were three groups: those who thought it doesn't do a good job at illustrating (like me, especially because it seems to be a confusing example within an example), those who thought it was enough for Keep Until Better Image Suggested, and those who thought it compromised copyright (it didn't). In the end, the clock ran out and no one came up with replacement suggestions, so here we go with some:
edited 22nd Sep '17 10:58:43 AM by Gosicrystal