But place a big enough obstacle along the route and these people could refocus their navigation around one static object, rather than on the less predictable movement of others in the crowd.
This is pure speculation of course.
Here's what my brother actually said:
Hello, Happy Birthday my brother.
What GV said he said:
Hello, The bird say my brought their.
Sounds like a case of poor cellular...
And that wasn't a 787 flying overhead, btw!
"The eleventh commandment was `Thou Shalt Compute' or `Thou Shalt Not Compute' -- I forget which." -- Epigrams in Programming, ACM SIGPLAN Sept. 1982