Here are my own abuses - purely for the sake of having a laugh at a geek night, and demonstrating what the compiler actually does with query expressions.
Arguably my "LINQ to Mandelbrot" is a bit abusive too :)
I was particularly thinking of abuse of the syntax by the way, but there are always plenty of ways to abuse the very presence of LINQ - doing things "the LINQ way" when there are simpler approaches available without using LINQ. For instance, getting to the nth element of an array:
// Sensible (we know that people implements IList)
Person x = people[10];
// Insane
Person y = people.Skip(9).First();
I suspect there will be more cases of abuse like this than abusing the power of query expressions, partly because many devs won't realise that abusing query expressions will even work :)
