Sniper Espresso Pot
(Too much time on my hands!)
The idea, espresso in the field!  Take 1 REI Espresso
cup, 1 REI Espresso maker, an old worn out ARMS*
mount, a short Picatinny Rail and some JP Weld*.  
Add 1 File and 1 Hack Saw, Cut and Paste as
necessary and you have the most-over-the-top rail
mounted accessory ever devised!