No. You should not.
But that's what happened at a Goodwill location in Franklin, Wis., on Saturday, March 19. According to WISN Milwaukee, employees at the store found three hand grenades while sorting through donations, prompting an evacuation of the building.
Police from Milwaukee's hazardous devices unit arrived on the scene around 12:30 p.m. and, thankfully, found that the grenades were inert. After investigators determined there was no apparent attempt to injure, the store reopened.
On its website, Goodwill lists a number of items that it cannot accept, including gasoline, shaving cream and carpet padding. The list does include "weapons," though it doesn't specifically mention grenades. (But, yeah, that probably should go without saying.)
This isn't the first time a Goodwill location has received the gift of hand grenades—somehow, this is a pretty regular occurrence. In 2013, employees at an Oregon store found a grenade with the pin intact. In November 2015, employees at a Kansas store found a live grenade still containing explosive material. And in February, a Michigan store received an inactive grenade. A quick Google search for "Goodwill hand grenade" returns a number of other examples.
So, to recap, if you were planning on donating hand grenades to your local Goodwill, please do not do that. Maybe donate a nice pair of squirrel underpants, instead.