When the ball was bounced to start the annual Easter Monday clash between bitter rivals Geelong and Hawthorn, the centre square contained eight athletes, one umpire, one Sherrin and a rogue pigeon.

As the first quarter rolled on, the courageous rock dove continued to attend centre bounces and was undeterred by the myriad of studded boots that tore up the turf around it.

Although the winged invader was finally shooed to the sidelines, it did get us thinking about the weirdest and wackiest groups, individuals, items and beasts that have crossed the white line in the past.

With the game of Australian Rules Football now over 150-years-old and enjoying sesquicentennial status, we have almost certainly missed some of the game's strangest objects and intruders, so please, let us know your nominations in the comments.

Without further ado, here are the 11 most abnormal field occupants in our game's great history - besides Mark 'Jacko' Jackson.

10. Bottle Blonde Tames The Tigers (1982)

Early in the 1982 decider's third term, a bottle blonde by the named Helen D'Amico entered the hallowed MCG arena, clad in nothing but a Carlton scarf.

Despite making a beeline from the bemused and bashful Bruce Doull, it was Carlton hardman - and supposed ladies man - Wayne 'Dominator' Johnston that escorted the nude intruder from the centre square.

Although the Blues' Team of the Century member was hot under the collar, the arrival of D'Amico brought about the departure of Richmond's lead, with Carlton posting 56-points to the Tigers' 27 in the second half to claim their fourteenth cup.

For those of you that have yet to see the footage, I suggest finding it yourself, as every edition available is NSFW.