 The numbers would go up in varying increments, sometimes 3 or 4 numbers differing by only a few pounds, and then a jump of several hundred pounds.There were also various special tapes that had holidays on them, if the contestant waited long enough (without being bonged out).An additional variation was the "Bouncing Bong" which, instead of just going up, went up and down randomly, with the contestant having no idea whether the next number would be higher or lower than the current one.