Clarke’s three laws, referring to Arthur C. Clarke.

The laws are:

• When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
• The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
• Any sufficiently advanced technology is indistinguishable from magic.

https://en.wikipedia.org/wiki/Clarke's_three_laws

I’d rather throw caltrops

That’s not an app. That’s a cat.