Scanner.

Dad: Do you have a scanner?

Yeah

Dad: can you use it by itself?

...what?

Dad: yeah can you use it by itself?

no it's not something you use by itself it would go to your computer

Dad: what? but why would that happen

it scans on the computer

*45 minutes later

Mom: Yeah your dad was talking about those things that cut up paper

a paper shredder...how is that a scanner.