Well one year Disney had an error on their Hours schedule and we thought BB opened at 9 instead of 10 (evidently it got corrected sometime after I planned my day), and we were WAY early (like 1.5 hours). My kids, only one of whom met the height requirement, were by far first but the taller one was not asked. A single boy (second to arrive) was asked and did it. Not sure if they maybe didn’t pick mine because they saw the other sibling couldn’t ride and didn’t want to possibly create an issue or what. But yes, be among the first, look enthusiastic, and hope for some luck.