>> for extra donut-points: the smallest? A 9V battery is for sissies, 
>> a
>> real man uses two 1.5V cells, or one, or just a potato with two 
>> metal
>> strips.

> ..... drops a fish behind the wallboards if he wants to
> annoy a household or office

... *very* wet blotter liberally coated in nitrogen triodide*.

Seriously though - this is an application for zinc air.
"230" cell 5.9 mm dia x 3.6mm thich gives 50+ mAh.


            RM

* don't try this at home - even though it's more fun per effort than 
almost another anarchy leaning activity available.
(If you do try this at home, against good advice, wear eye protection 
and realise that iodine stains are forever, be it in clothing or 
linoleum. )
((Ask me how I...))

Extra points when used in the dark - flashes nicely.

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