A pet video phone
TV for pets
When humans are bored or need to relax, they watch tvs. Pets don't have an equivalent, and that might not be fair.
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A train that ejects passengers at the right station
A few years ago, I took the Bart from Mission to to
A tower bus
We could save a lot of time and elevator energy if buses had more floors
Toddler toothbrushing
Mouth openness as a play button
A heavy-duty photocopier that also cleans the floors
When making copies mobs the floors