Who said he tried to disprove the existence of UFOs?
In what way is it entertaining? He's funny. Watch it.
In what way? Neil deGrasse Tyson is great, but I can't imagine that video is anything more than the usual "no scientifically valid proof, eye witnesses are liars/drunks/crazy, etc.", which is all well and good, but it doesn't disprove the existence of UFOs any more than crazy witnesses prove them - a point usually lost on people who stump this kind of stuff to make themselves feel smarter than the "believers" they're ridiculing.
