Potted Evidence

Husband is talking to himself as he works on the computer, finishing a large project. Wife is reading in the next room. 

Husband: Aha! All done. But will it work? Let's see...

Silence. A few clicks on the key board. 

Husband: Looks good. But the proof is in the potting. 

Silence. More clicks.  

Husband: But what... is the pot... made of? These are the questions.