During my first tour of duty in Vietnam (1967–68) we were under the old rule of one beer per man per day. In an effort to ‘savour’ the event, we would drink them a little faster than normal and then lie down on the sandbag bunkers and let the sun warm up the belly.
After a few minutes you would stand up very fast. The reaction was like that of smoking your first cigarette and getting very dizzy. Short-lived, but something to look forward to the next day!