Unrealistic expectations
Expecting somebody to find and do something impossible.
The teenager commited suicide due to unmet unrealistic exectations by someone in his family. Unrealistic expectations are the kind where somebody is really never going to be good enough, even if they did something impossible, then they went on and did a thousand more impossible things.
Unrealistic expectations
Expectations that shouldn't be but are.
This rock band Solence has unrealistic expectations of their audience, they are daring the audience to come and beat them up. Not only does it not make sense to dare a bunch of people you never met (that you would otherwise have no problem with) and who have never met you (and would otherwise have no problem with you) to come and beat you up. The logistics of it alone for them to locate these guys based on what time they're going to be where and trying to pinpoint them even though the audience members trying to do all this stuff have to work the next day, it's an unrealistic expectation and the band knows it when they write lyrics like that. What kind of audience member has time to go find and beat up some band member they never met?