Kindergarten chairs!
On our first evening in Hue last March, the second eatery we visited had precisely these tiny plastic chairs which we eyed rather cautiously. There were 6 of us from Singapore, and all of us were rather hesitant about sitting on them, pretty doubtful that they’ll hold our weight.
One of my friends decided to take a chance and sat down on one. There was this loud CRACK as the entire chair just broke apart, splaying its legs in 4 different directions!! The rest of us were aghast! The shocked Vietnamese diners from the other tables all stared in our direction as my friend half-rolled, half clambered to quickly pick himself up.
The owner of the eatery then suggested that each of us stack 2 chairs together for added strength. I stacked 3 for myself - I’m 187cm and 118 kg/255 pounds - not taking any chances! 
