My grandfather has been through a lot in his time. When he was in the war, he survived a mustard gas attack. And later down the line, he survived being pepper sprayed by the police. He was certainly a real seasoned veteran.
Seasoned Veteran
Explanation
Explain Bear
Listen up, buttercup. This joke is playing on the word "seasoned". You see, mustard gas and pepper spray are both seasonings. And the dude is a war veteran. Get it? Now go back to drooling on yourself.