Learning can be Exciting. one thing you do when you Learning is Reading. Reading is related to See. See is related to Face. 
Weapon is related to Crop. Crop is related to Alien. 
Exciting <--HasProperty-- Learning --HasSubevent--> Reading <--RelatedTo--> See <--RelatedTo--> Face 
Weapon <--RelatedTo--> Crop <--RelatedTo--> Alien 