Very interesting, especially considering that beer, unlike water, contains plenty of nutrients capable of supporting the growth of bacteria and fungi. I would be reluctant to drink beer from a public fountain.
Since this is the internet, someone needs to point out that Daddy Longlegs are not spiders. "Although superficially similar to and often confused with spiders (order Araneae), Opiliones is a distinct order that is not closely related to spiders within Arachnida. They can be easily distinguished from even long-legged spiders by their fused body regions and single pair of eyes in the middle of their cephalothorax (spiders have an 'abdomen' that is separated from the cephalothorax by a constriction, as well as three to four pairs of eyes, usually around the margins of their cephalothorax)." [Wikipedia]
One problem is that the malefactors know who you are and you don't know who they are. A stunt like this is an invitation to have a rock thrown through your window at night or your car keyed or worse.
Apologies in advance, but the title of this post brings out the "grammar Nazi" in me. Figurative "milestones" are based on the literal milestones situated along Roman roads. Writing in The Atlantic in 2010, Michael Kinsley noted that "hitting a milestone" is a bungled metaphor ("you don’t “hit” a milestone if you hope to reach the next one.") Milestones are passed. :.)
I do wish people who do these stunts would specify for potential copycat viewers that the inhaled gas is "Heliox" - a mixture of helium and oxygen. Inhaling pure helium is dangerous and potentially lethal.
A less expensive way to buy postage stamps (for those who do use them) is to get in touch with your local club of stamp collectors; someone there can probably sell you postage at a deep discount from what it costs at the post office.
http://www.theatlantic.com/magazine/archive/2010/01/cut-this-story/307823/