Accounts tell of an incident at Monza where in a joint helicopter ride Senna had been showing off his new tailor made briefcase. Having been made of carbon fibre composite, Senna argued that it should be virtually indestructible. Berger, without much hesitation and much to Senna's disbelief, opened the door of the helicopter and threw the briefcase out, to test the hypothesis.
"It fell somewhere near the course but we found it again," Berger recalled with a cheeky grin.
On another occasion, in an Australian hotel room Berger filled Senna's bed with animals. Senna understandably infuriated, confronted Berger by saying;
"I've spent the last hour catching 12 frogs in my room," to which Berger replied, "Did you find the snake?"
"Actually they weren't frogs, they were bigger, more like toads. In Australia they have this kind of stuff. I thought he liked animals but clearly not," Berger explained.
It was an incident that prompted retaliation by Senna, who then proceeded to put a strong smelling French cheese in the air conditioning unit of Berger's room.
On another occasion, Senna and Brazilian compatriot Mauricio Gugelmin decided to fill Berger's shoes with shaving foam on a fast train ride to a dinner in Japan. Having been forced to attend the dinner wearing a tuxedo with sneakers, Berger vowed for retribution. It was at the Japanese Grand Prix a few days later that Gugelmin (driving for Leyton-House) was approached by Joseph Leberer, the McLaren team nutritionist, offering fresh orange juice. Ever vigilant, Mauricio declined the suspicious offer. He would later expand:
"One hour before the race starts he crushed four sleeping pills into that juice and sent it to me. I would pass out at the start of the race in which the world title would be decided. The cars roaring by at the track and I snoring in the cabin, can you imagine it?"
Best known is probably an incident in which Berger replaced Senna's passport photo with what Ron Dennis described as "an equivalent-sized piece of male genitalia". Senna's fame meant he rarely had his passport checked, but on a later trip to Argentina Berger's prank resulted in officials holding the Brazilian for 24 hours. As a response to this gag, Senna superglued all of Berger's credit cards together.
Another incident occurred years later at Ferrari, when Gerhard Berger and fellow F1 driver Jean Alesi were instructed to collect team director Jean Todt's new special made Lancia roadcar. Returning to the team headquarters entrance, Jean Alesi lost control of the car after Berger unexpectedly pulled the handbrake. Having flipped the car and skidded upside down to a halt in front of the entrance, Berger admitted to Todt that they had put "slight curb marks on the roof".
