Which is the most awkward moment of your college life?

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In my class there is a guy named thangaraj... 
He will be silent all times....

If he speaks just single sentence, Sure it will be a laughing treat for us... 

I remember a day where we and our HOD had hot discussions in the class regarding fees rise.... Many were asking many questions, How, Why lik that...

The discussion took more than a hr... 

Finally Thangaraj stood up and raised a question..

Thangaraj: "This will be the final question of this session sir"
HOD (With eagerness): Ya tell me...
Thangaraj: " Kadaisiya kekaren... Fees a koraika mudiyuma, mudiyatha.. "

Our class started laughing loud... HOD went out with anger.. 
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    Which is the most awkward moment of your college life?