What is the similarity between a train and my thoppah?
When Ashwin sees a train, he can't stop calling out Theen theen (notice the additional "n" now). The sight of my thoppah gets a similar reaction from him.
When he sees a train, he wants to "theen okkachi". When he sees my thoppah, he wants to thoppah okkachi (I should carry him so that he can sit on my thoppah).
He fondly remembers that he did thachi on the train. Where did he thachi last night? On my thoppah of course!
I'm totally flattered. NOT!