Some People Were Taking A Tour Of A Rubber Factory

On the tour they stop by where the factory made baby bottles caps. Everyone could hear the machine working: "Shh, pop, shh, pop, shh, pop". One of the tourists asked the guide what the noises were. "well you see, the shhing sound is the rubber filling the moulds and the popping is the machine poking a hole where the liquid will come out" Everyone thought that made sense and moved along the tour. Later on, the group came to where the factory made condoms. This time they heard, "Shh, shh, pop, shh, shh, pop". And again someone asked what the noises were.
The tour guide answers, "well its the same noises as the baby bottle caps. The shhing is the filling of the condom mould and the popping is the machine poking a hole in every other condom" One man interjects, "well that can't be too good for the condom business!" The tour guide then replies, "yea but it's great for the baby bottle cap business!"