My husband & I have been on 4 cruises and have enjoyed our table mates on every cruise, except one.
Last year we were on the Enchantment of the Seas(gorgeous ship!). We were at a table of 6. One couple was very strange...........thier choice of topics to disguss were very unusual, and disgusting. Everynight the husband would tell us about his constipation problems and whether or not he was able to relieve himself. This was one of the milder topics. I will not even mention the others.
Anytime we saw them on the ship we turned and walked the other way. Very strange. But we laugh about it now.