In addition to the ability to create holiness, human beings also have a responsibility to be considerate of others; to behave in accordance with established societal norms; and to be aware, at the most basic level, of the presence and the immediate comfort levels of the people around them. These responsibilities do not cease to exist when you happen to be creating holiness. I don't understand why it happens so often that at a simcha, a group of men will start calling "Mincha!" or whatever, and then stop, wherever they happen to be at that moment, and start davening together, complete with Kaddish and Kedushah, as if they have just walked into a shul building instead of stopped in the middle of a catering hall. I have seen these impromptu minyanim block elevators. I have seen them block entrances to restrooms. I have seen them block pay phones, building exits, and stairways.We mentioned this a while back in our Guide to Jewish Wedding Minhagim.
mentalblog doesn't like Matisyahu's new material.
Finally, here's Heichal HaNegina on Tu B'shvat.