if the user has a setting in their browser in this case an extension for firefox to always prefer highest quality available, the youtube link will be outside the acceptable range for the youtube embed code instructions. with that in mind the youtube instructions are not accurate, i have a code with extra characters, that are not included in your example. if i include the characters the embed shows html coding as part of the embed, and the video doesnt play. if the extra characters "=1" at the end in this case are included in the embed code. if removed it embedds a video that cannot be seen. it ONLY works if you delete the additional characters "&hd". so the link you present in the example is only if users have made no adjustments to how youtube is displayed on their computer, in this descendents example the link is for the lowest possible resolution, unless one is required to also input the height and width. which ALSO isnt explained in the instructions whether to leave it blank or not.
123 General Talk
I would love to have someone who pretty much no matter what I would tell them the same thing about themselves every time I see them. I think after like 10 times the level of comedy I would take from it would be astronomical.