I walked up to a table taht had mom, dad, 2 kids and a baby. I say "Hi I'm Paddy..." and mom unbuttons her blouse, pulls a breast out in front of me, God, and everyone else and starts to feed the baby. No she does not cover herself as some women do just feeds the kid right there. What do you do?
Another time as I approached a table I heard the couple talking about who gets which car and how often he can visit the kids. They were discussing their divorce. What do you do?
A guy comes up while you are at a table entertaining 3 kids and says "are you going to come over to my F***king table and do this sh*t for my girlfriend? She wants you NOW!" What do you do?
Hmmm, some tough situations. I don't have any table hopping experience, but I'll go ahead and stick my neck out on the boards here and take a stab at them.
For the table with the breast feeding mother, I would assume the rest of the family is probably used to this and doesn't see anything unusual or scandalous about it. Probably the thing to do would be to concentrate on entertaining the rest of the family while mommy takes care of feeding her kid. Don't come off as shunning her, and certainly acknowledge her if she makes a comment about the performance, but don't make any comment about what she's doing. If you don't act bothered, flustered or uncomfortable, and just do your normal show, everyone will have a good time, and hopefully the adults will appreciate your discretion and your effort to entertain the kids.
The table with the divorcees is pretty awkward. My instinct would be to say, "My apologies, it looks like I've interrupted an important conversation. My name is Mike, I'm the house magician, I'll let you get back to your conversation, but if you would like to see some magic later, let your waitress know and I'll be happy to show you a few things." But even that might seem a little invasive. I know many magicians say you should never ask if someone wants to see magic, but this might be a time to use that exact opener. Let them turn down your offer, say "All right, well thanks for coming to [restaurant], please enjoy your meal."
As for the guy who starts swearing in front of a table of kids . . . this is tough. I would probably tell the guy that I will be over to his table just as soon as I'm done with the current one. Once he leaves, I would apologize to the family for the disturbance and reassure them that I will let the manager know about it. I would do one more routine, something really fun and do my damndest to get the kids laughing so I can end on a high note. I'd then go over to the other guy's table, do a short set for them (preferably nothing that would give the guy too much a chance to heckle) then excuse myself and tell the manager about the incident. It's their restaurant, and thereby up to them how they want to handle the situation.
Okay, I think those are my final answers. Again, I don't have any table hopping experience, so don't take these as professional opinions in any way. I would be interested to know what the real professionals on the board think about these responses. I could be way off the mark, and if so, please tell me. It's the only way I'll learn---well, the only way without burning a venue for other entertainers.