Eight is obviously tape. Just because it ryhmes.... Sort of. Uh clear tape. Clear masking tape.

Step 1: Get some tape.

Step 2: find a door/doorframe.

Step 3: Tape over the whole doorframe.

Step 4: Call someone on the other side and watch them walk through it.

Tip: Be sneaky since it would be quite complicated to get someone to walk through tape that they watched you put there.

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