2.25 pm Australia have taken nine wickets after lunch for 47 runs. South Africa have been bowled out for their second lowest total since readmission. Watson took five in a blink of an eye, and Harris cleaned up the rest. This is a stunning turnaround. And the ball didn't do much at all. Certainly not as much as Steyn and Morkel did with it earlier in the day, when Australia's tail and Clarke added 70 runs. Watson and Harris just bowled wicket to wicket, with some inswing. Nothing extravagant. I need to catch my breath.

Australia lead by 188, Clarke's innings seems priceless now. How can South Africa pick themselves up from here?

Adrian: "Apart from the openers, South Africa's scorecard kinda reads like my phone number"

"That's very kind of Aus to bring back Leaking Johnson instead of on-fire Watson. I suppose all out for under 100 doesn't give Aus much of a challenge," says Neil.

Dirk: "Jermaine Lawson topped this. He cleaned up Bangladeshis tail in Dhaka 2002. 5 in 13 balls, or even better 6 in 15."

Avi Singh: "Hey George, from S Rajesh, Ernie Toshack took 5 wickets in 15 balls as well for Australia v India way back in 1947! And I remember India getting bowled out in exactly 20 overs on day 1 in Ahmedabad by South Africa in 2008, to give Stephen one instance of a team having batted less than what South Africa have in this innings.

Johnson's back, replacing the fearsome Watson.

Brandon: "Holy moly. I check in ONCE and this is what I see.... Says something for the lack of preparation with which we came into this series. SINCE WHEN do we take on a Tier One nation without having (at least) played a series against Zimbabwe / Bangladesh etc?"

Jason: "Was Caddicks 5 for in 15 balls the first 15 he bowled though? Surely 5 wickets in the first 3 1/2 overs you bowl is a record?"

Jason: "Was Caddicks 5 for in 15 balls the first 15 he bowled though? Surely 5 wickets in the first 3 1/2 overs you bowl is a record?"

Tweeter: "Oftentimes a team is criticised for only batting for a day in their first innings. SA aren't going to even bat for a full session. Special effort from Australia, less than ordinary response from South Africa!"

Stephen: "Anybody know the least amount of overs in a test innings? This must be going close."

Jamie Alter has messaged me with this: "Andy Caddick took five in 15 balls for five runs against West Indies at Leeds in 2001." Can anyone find one quicker?

Imran Tahir is the No. 11. South Africa were 49 for 1 after lunch. They are now struggling to avoid the follow on. Stunning.

Phew, we are in only the 22nd over!

Jeremy: "Clarke's 5 wickets came in 25 balls. Looks like Watson just beat him!"

Morkel is the new batsman. They need four to avoid the follow-on, though Clarke won't enforce it even if he could.