Step 1: Acquire a fan exactly like this one -
Step 2: Place fan on kitchen floor.
Step 3: Turn fan on high.
Step 4: Sit down beside fan.
Step 5: Wait for your momma to come and stand next to the fan with her back to it.
Step 6: Plunge stick deeply into wide gap at top of fan grill.
Step 7: Watch your momma jump and scream.
Step 8: Repeat as necessary.
(NOTE: I actually used a long feather instead of a stick. It made a surprising amount of noise after being ripped from my hands and getting caught in the fan blades, but I'm betting that a stick would make even more. The long handle of a pinwheel might work, too. Or a plastic fork. Feel free to use your imagination! Then come back and report the results here if you survive.)