Once Upon a Time on a Greyhound Bus
I had no choice but to sit beside a pothead (that was the last empty seat). He was in a very chatty mood although he could barely sit up straight. As a gesture of friendship he asked me whether I wanted gum and I politely declined. Before I knew it he was taking out the gum he had been chewing from his mouth and handing it to me. When he sensed my distaste, he got upset and grumbled about how standoffish and unsociable I was till he lulled himself to sleep.