customer: my Coke tastes funnny and this shrimp roll is not good
me: okay, I can either offer you a refund for those or give you another one
custormer pushing his plate and drink to me: no, really, if you don't believe me try it!
me: sir, that's really not necessary
customer pushing it even more: no, here! try it!
me: sir, i can't have those but i didn't say i don't believe you. would you like a refund?
customer *angry*: no, i want you to eat this!
me: i can'thave those, i'm diabetic and allergic to shrimp
customer: oh... *stops and thinks for a while* still, you should try it doesn't taste alright
me ft the loudest sigh i could do: sir, i can give you a replacement drink and a refund for your food, i'll also tell the kitchen staff to see if there's anything wrong with the ingredients, but i'm not going to risk my life just so you can prove me you have a point