This is valid and prints False then 42. (Hint: Unicode)

ConfusableIdentifiers.cs

using System;
 
static class Program 
{
    static bool A()
    { 
        return false;
    }
    
    static int А()
    { 
        return 42; 
    }
 
    static void Main() 
    {
        Console.WriteLine(A());
        Console.WriteLine(А());
    }
}

This was a follow-up to this tweet where I joked about programming in French to "overload" by return type:

https://twitter.com/nguerrera/status/429481674758316032