The deliveries may be interrupted by an over bowled by another bowler from the other end of the pitch or the other team's innings, but must be three consecutive deliveries by the individual bowler in the same match. Only wickets attributed to the bowler count towards a hat-trick; run outs do not count.

Has anyone took 6 wickets in an over?

In a rare instance, a bowler named Aled Carey produced the 'perfect over' by taking six wickets in six balls while playing club cricket in Australia. His first wicket was caught at slip, followed by a caught-behind, an LBW and three consecutive clean bowls thereafter.

Has anyone ever got 4 wickets in a row?

The only man to have taken four wickets with consecutive balls more than once is Robert James Crisp (1911-94) for Western Province v. Griqualand West at Johannesburg, South Africa on 24 Dec 1931 and against Natal at Durban, South Africa on 3 Mar 1934.