First thing 你 gotta do, is find an old gardening, sports, 或者 construction tool that no one uses anymore, e.g., a shovel, baseball bat, lead pipe, etc.
Then 你 gotta make it look 更多 shitty than it already is 由 wrapping tape and 或者 strings around it.
After that, 你 gotta put some DIY mods on it to make it do 更多 damage. For example, 你 can put some spikes on your bat 或者 put a bunch of rocks in an old pipe to make it heavier.
Once no one suspects the weapon of choice, 你 can take out your target, but do it this exact way: Follow them, tap them on the shoulder, then when they look back, knock them out 由 hitting them as hard as 你 can with your fist and 或者 the club.