Fun with folder in Windows

1. create a folder without a name in Windows

-> Create a new folder on desktop or anywhere you want.
-> Right Click on folder and select Rename. 

-> Now Keep Pressing Alt and type 255 or 0160 or 999999999
-> After that leave Alt Key and Press Enter.

    Done.

2. Folder name 'CON' in Windows is invalid.

There are a number of Reserved words that cannot be used to name folders on Dos or Windows Operating System. 
COM, PRN, AUX, NUL
LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9
COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9 

Solution
-> Create a folder and press F2 (Rename).
-> Now Keep Pressing Alt and type 255 or 0160 or 999999999 from Num Pad.
-> Release the Alt key and then type CON.
    Folder Is Made.

3. GodMode in Windows

-> Create a new folder on desktop or anywhere you want.

-> Right Click on folder and select Rename and Type.

        hindipc.{ED7BA470-8E54-465E-825C-99712043E01C}.

 -> Press Enter

-> Open Folder
Your folder will contain 249 items, representing virtually all configurable options in windows xp, vista, 7, or 8.