It's alright, that was many years ago. I don't know what made him think it was food. We got him when he was 3" or 4" inches long and grew him out in a tank full of plastic plants (can't keep live ones, the cichlids and the pleco would destroy them) and continued to keep them in his adult tank. We fed him Hikari pellets and occasional treats of boiled shrimp and cut up fish. The plastic didn't look like his usual food at all.
Oh, it's okay. Well, I consider it a "freak" accident because a normal accident would be like him jumping out of the tank or something. But no... The stupid fish tried to eat an large plastic plant in the middle of the night. He nearly got it down whole and then got the bottom end lodged in his throat. Woke up in the morning to water everywhere and him swimming around neurotically, banging into things. We had to wrestle him out of the tank into a large Rubbermaid tub and pull it out of him. He was visibly stressed and lost some fins and scales while thrashing around in the tank, but he seemed okay. He held on for a while, then took a turn for the worst and became lethargic. Eventually, he couldn't stay up right. I tried to hold him up, but he kept turning over and he died in my arms. I figure he must have gotten some internal damage from ramming himself into the tank walls.
I just have to ask, what was the "freak accident" that occurred with your arowana? Sorry for your loss. You don't have to tell me if you don't want to talk about it... But you can't say "freak accident" without leaving me wondering XD