In this video, father Andrew Lister is sharing a popsicle with his son Heath when he suddenly gets a scratching in his throat he can't control. The dad lets out a simple cough that sends Heath into a peal of laughter.
Realizing how tickled his kid is by the sound, Lister proceeds to continue coughing, eliciting numerous giggle fits from Heath, each one heartier than the last.
It's a short clip, but a powerful one. Heath's contagious laugh is bound to help anyone stricken with a serious case of the Mondays.