Some classics that have pissed me off in the past...
Eating smoked fish and putting fish bones back on the serving plate after pulling them out of their mouths...
Insisting they cannot eat a main course, getting something else made especially for them, only to eat the original.
Eating a meal before saying they are allergic to tomatoes and will get a huge migraine...
Once had a charter client take 90% of the pasta before half the table got any... and then left most on his plate.
