Federico Bahamontes, one of the great climbers in the sport, famously took an ice cream break at the top of the Col de Romeyeres(? IIRC) in the 1954 TdF. He claimed he had broken a spoke halfway up so he attacked to gain enough time to get a new wheel without losing time on the peloton (something like 14 minutes back), and while waiting for his team car had an ice cream. Others note that he was a poor descender and preferred to follow a wheel downhill and suspected he was waiting for someone to catch up.