Nowadays, is possible to hide a camera everywhere... but... where? The Japaneses are expert on placing them in weird places, those are their best solutions 
If you see a normal ID card like this, what will you think?
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In some occasions, it won't be noticed.... let's observe it closely::
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There is an hidden camera in the D, and, for making it looking it normal, also the other D has a "black spot" for making it look normal... smart!
4 gb of memory, is on sale for just 13000 yen
But, outside of a work place, it looks suspicious, so this is solution #2:
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A "quite" normal watch that...:
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8 Gb and for just 10000 yen, can be yours.
But, honestly, taking pictures with a watch it is quite suspect.
The best solution is this:
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A normal, common necktie that...
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Has an hidden camera with a 4 gb memory!!
And for taking pictures, you use the remote control, keeping the hand in your pocket, nobody will notice
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Also this camera is just 13000 yen... with such cheaper cameras... we should start to be diffident of anyone!