Step 1: Find an interesting box tall & wide enough for a cat.
Step 2: Tape up one side, leave the other side open.
Step 3: Place box on floor in front of cat. Make sure they see you do it.
Step 4: Walk out of room, count 5 Mississipis.
Step 5: Walk back into room, your cat will be in the box.
Guaranteed 100% Success rate from extensive trials at my house.