What is bug? It usually means wrong program that happen in our computers or cellphones,etc. While today we are talking about a lovely behavior that happened in Tim Hortons, buying hundreds cups of coffee for strangers.
It was was start by a man who walked into Tim Hortons (a coffee shop in Canada) in Edmonton, he paid for 500 cups of coffee with no apparent reason and gave those 500 cups of coffee to the strangers who walked into the shops next by. After that, things like this keep happening.
Some people doubt that it was plan by Tim Hortons themselves but they denied those claims. Analyzing this event, for sure, no matter it was plan by Tim Hortons or really did by the customers themselves, it spreads loves but bugs to people, especially to people who cannot afford it.
Although Tim Hortons was saying that, but we can still make a assumption that it was planed. I would say this was a really good strategy for marketing. They used a small amount money and made a very good effect in the society, it become a efficient way to let people know their brand. It also makes people have a better impression on them and consumers are more willing to buy their products.
http://www.rcinet.ca/en/2013/07/29/coffee-giving-bug-spreads-in-canada/
https://www.google.ca/search?q=tim+hortons&hl=en&gl=ca&authuser=0&source=lnms&tbm=isch&sa=X&ei=pNpTUuork9GIAqjIgZgD&ved=0CAcQ_AUoAQ&biw=1366&bih=578&dpr=1#facrc=_&imgdii=_&imgrc=9gwopeI_mG2l-M%3A%3B7o6SNjqsKCpvPM%3Bhttp%253A%252F%252Fwww.charlanrebels.com%252Fwp-content%252Fuploads%252F2012%252F01%252Ftim-hortons-coffee.jpg%3Bhttp%253A%252F%252Fwww.charlanrebels.com%252F2012%252F01%252Fits-tim-hortons-night-saturday-january-28th%252F%3B450%3B587