Grandpa,

If you ask me, I believe Aunty thinks you might be a bit introverted, shy and afraid to say what's really on your mind. Suggesting that you might benefit from the use of meth-amphetamine may just be her way of trying to get you to come out of your shell a bit and voice your true opinions! ;\) :p

...and if that doesn't work, there's always the added weight-loss benefit... \:D \:D (just kidding) \:\)
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A day late and a dollar short...