Song: "I Was Only Joking"
Artist: Rod Stewart
Peak position on the Cashbox Singles chart: #19
Number of weeks on the Cashbox Singles chart: 14
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| April 29, 1978 | 70 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| May 6, 1978 | 61 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| May 13, 1978 | 50 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| May 20, 1978 | 39 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| May 27, 1978 | 32 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| June 3, 1978 | 27 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| June 10, 1978 | 24 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| June 17, 1978 | 22 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| June 24, 1978 | 20 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| July 1, 1978 | 19 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| July 8, 1978 | 38 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| July 15, 1978 | 60 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| July 22, 1978 | 75 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
| July 29, 1978 | 98 | I Was Only Joking | Rod Stewart | Warner Bros. 8568 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.