Me everytime we're driving and I spot a FedEx truck:

I yell "I SHIP IT LIKE FEDEX!" in my semi-loud voice.
It is done for the fun [me and my accidental rhymes].
If it's in the distance I'll maybe cup my hands around my mouth to 'amplify' da sound and yell that.

Strange habit I know..

(by the way the other day [there I go again] I spotted like 4 of 'em. So four times the fun! [alliterations now?]
My family is quite familiar with this I do.. heh.)