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summary: |
  Sam (roommate) broke the vase.

  Sam was home studying when they got a phone call.
  During the call, they were pacing around the living room.
  Their basketball (they were supposed to practice later) 
  bounced and knocked the vase off the shelf.

  Alex (visitor) arrived after the vase was already broken.
  Sam texted Alex to come over, likely to have a witness 
  or to delay being found out.

key_points:
  - "Identified Sam as the one who broke the vase"
  - "Understood the cause - basketball knocked it"
  - "Realized Sam was pacing during a phone call"
---