Be honest. Sometimes when babies get scared, as horrible as it may be to think it's funny, it is a little bit... Depending on the circumstances of course.
This video is one of those times where it is completely acceptable to laugh when the baby is scared. Why? Because of what the grown-up does, nonchalantly, that puts the baby in tears.
Who knew a fart could make someone scared and CRY?! I thought if one made tears come out it was A) because it was so funny you cried, or B) it smelt really, REALLY bad.
I'm sure he'll watch this when he's older and try it on on his kid, though. Then it'll all be okay.