Life is a type of Adventure. 
Surprising can cause/lead to Laughter. one thing you do when you Surprising is Grab. Grab is a type of Seize. Seize is a type of Overwhelm. 
Adventure <--IsA-- Life 
Laughter <--Causes-- Surprising --HasSubevent--> Grab --IsA--> Seize --IsA--> Overwhelm 