don't worry pinpoint we all go through that u are not only the one
i have no idea what to do in such situation may be u should follow what bittertruth says 
for me i would speak in loud voice avoid talking be rude speak vulger breath heavily make stone face and make angry face all the time or just kichha parera suck it up  if necessary  things like that 
but that's me and i got more trouble doing that
 i would say listen to bittertruth may be he is right he seems to know how to deal with it