There are way too many videos online of poor pets thinking they can run through glass until BAM, the see-through material proves otherwise. This video shows the opposite experience, and it's way more amusing--and humane! A Reddit user posted the Imgur clip below, and for reasons that will immediately become obvious, people are loving it.
It seems this set of doors used to have glass panes in them. The cute pooch believes that, even though there appears to be nothing stopping it from jumping through the clear space in the middle of the doors, there is, and if it attempts to go through, it'll get stopped...and hurt. The men demonstrate that, no, there really isn't anything in the way, and the dog has the funniest, most confused reaction to their magical abilities.
Don't worry, Rover! You're entitled to wait until the door is opened for you before you walk through.