Gozirra!

Making a monster:

[Godzilla's] action sequences were filmed at a high speed so that when it was slowed down for viewing, the buildings crumbled more realistically. But this meant that the set had to be lit twice as bright as when filming at normal speed, and the hot lights caused temperatures inside to suit the climb as high as 120°F, with the only ventilation provided by the eyeholes in Gojira's neck.

Under these conditions it was nearly impossible to film for more than a few minutes at a time. Typically, the actor inside the suit would spend 7 to 10 minutes rehearsing a scene in costume with the studio lights turned off. Then the lights came on and the scene was filmed for about three minutes, which was all the actor could take before he risked passing out from heat prostration and suffocation. Collapsing mid-scene was not unusual, and two actors who alternated as Gojira (Haruo Nakajima and Katsumi Tezuka) sweated so profusely that the crew drained as much as half a pint of sweat from the suit at the end of the day.

Draining mixed man-sweat from rubber suits sounds like an intern job if ever I've heard one.