This game never gets old.
Going for a drive somewhere. Pass a field full of hay bales. Yell out “HEY!!!!”, loudly and without warning.
Point out the window for added effect.
(For safety reasons I only recommend attempting this if you are the driver. I’ve also noticed that after about the fifth time the passengers tend to mutiny. If this does happen just sigh and with a heavy, reassuring voice, say “hey…” And point out the window. It’s a strange phenomenon known as ‘pun overload’ – no harm can come to you.)
Speaking of pun overload…