I've just heard about a mass balloon release in memory of some teens who were killed in a car accident. I hate them and think they're selfish; they're so damaging to the environment (ingesting balloons or the string can lead to a horrible death for both farm and wild animals, including marine life.)
The emoting behind them is lovely, but I hate the fact that they're essentially delayed littering. Releasing bubbles or seeds can do the same thing but without killing wildlife!