Reader-added tags include "Favor curry while the wife's not looking" (punning "curry" with karei ("splendor"), "Splurge while the wife's not looking," and "Now in surveillance camera mode".

The survey stalls for time:

What stalls catch your eye?
• Food stalls
• Shooting galleries & such
• Mask-sellers
• Fortune lotteries
• Shops with rows of pirate goods

So sneaky.

...That last choice is so, so familiar to me...

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Helepolis said:

But what if her Yin Yang ball is recording everything for later play back?

She doesn't even need to watch the recording; he just self-pwned himself by illustrating his crime in the 4-koma.

OverlordLaharl said:

She doesn't even need to watch the recording; he just self-pwned himself by illustrating his crime in the 4-koma.

It was well after the fact by the time he drew this. I suspect any time he tells on himself like this, his wife already knows.