Car breakdown?

Not as such really, but something was having some issues. So what happened was I went for an outing with few relatives. As usual when you go away from city, the roads get worse. And we got onto this patch of road where patch was very uneven and full of potholes. The weather being pleasant, we had windows open.

Then a metallic sound was heard once in a while. I could tell that it was coming from exhaust-pipe/muffler area. It was coming from rear-right corner of the car. It seemed that when the rear-right wheel went into a dip, muffler or some portion of exhaust would rub somewhere causing the metallic sound. I surmised it as a sum of 3 factors causing this problem. 1 fully loaded car with 4 adults, 2 maybe a slightly low tire pressure, 3 hilly terrain with potholed road causing more suspension movement and thus something getting scraped somewhere.

I did stop the car and took a look underside but did not find anything obvious like a stuck branch or loose stones. And afterwards I drove a little bit carefully and the sound was gone. Also on level road, nothing was of issue.

So we decided to ignore the issue and enjoy the outing. And that's exactly what we did!!