Ugh. MacArthur reference a total boner killer. (JK!)I usually will just shout out "There she blows!" or "Remember the Maine!"
Though sometimes after I pull out, letting my still warm jizz run out her snatch, I will loudly proclaim with great promise "I shall return".
But that's just me.
...When I hear "I'm gonna cum", it lets me get ready to receive the load where I want to get it.