I need to make some spy gadgets that I can record what people are doing in the neighborhood?

Question

There are these teenagers in the neighborhood that have been causing trouble and even saying terrible things to adults, example 1 my mom! The people in the neighborhood want me to record them with my cell phone but I think that might be too obvious and they might crush it :O.

Do you have and spy gadget ideas that I could make for cheap?

P.S. my cell phone has a sound recorder, and the police have already come but there gone before they come

Answer 1

What you got to do, is confront them and calmly and nicely kick their asses for them.