Last October we (DH, DS 10, and myself) were seated at Teppan Edo (one of our favorites!) with 2 moms and their 3 kids (1 mom had 1 kid, the other had 2). We were seated at one "end" of the table -- DH and DS on the short end, then me -- and the moms very carefully put themselves together at the other short end and put the youngest child (a totally out of control boy of about 6) next to me, and the two girls who were older and slightly better behaved in between themselves and the little boy.
The two moms then proceeded to drink fairly heavily (for people with 3 children to tend) and ignore the kids completely. The little boy was all over me -- I had to repeatedly move him back over into his seat, etc.
When we find ourselves in situations like this, it's so hard to know what to do -- we're polite, we're not interested in getting into an argument with anyone, and we just want to enjoy our meal or whatever. I think that if I had it to do over again, I would have spoken up right at the beginning and said something like, "he really needs to come and sit next to you; I'm afraid he's having a really hard time way down here" or something like that. But it escapes me how people can be so unconcerned about their children or about their impact on others.
It won't keep us from returning to Teppan Edo, though!