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And who can forget the abuse of =, +=, ++/--, ... etc?

public static void main(String[] args)
{
int a = 1, b = 2, c = 3;
c += b = a++;
System.out.println(a + " " + b + " " + c);
}

Not necessarily weird syntax, but an abuse of Java's arrays to get pass-by-reference(ish) for primitives:

public class PrimitivesAbuse
{
public static int factorial(int n, boolean[] success)...

I remember Json posting some funny allowable names for classes/fields/methods.

http://www.javaprogrammingforums.com/java-code-snippets-tutorials/874-general-cs-concepts-post4807.html#post4807
...