Theo Walcott and Per Mertersacker's victory routine is rather well known by now.

The England striker and the BFG leap and 'bump' each other in the air - much to the delight of the Arsenal support.

Arsene Wenger's team beat Sunderland to progress in the FA Cup, Joel Campbell, Aaron Ramsey and Olivier Giroud scoring goals as the Gunners came from behind to win 3-1.

So far, so good.

There was just one problem - Per Mertesacker was rested and Walcott had no one to bump with.

Luckily (sort of, we're not condoning this type of thing), a pitch invader was on hand to step in for Mertesacker.

Initially, stewards stopped the fan from going on the pitch, but Walcott had a word and eventually did his trademark bump with the youngster.

(He fell over, but we won't mention that.)

Walcott then started to walk away but the fan asked him for his shirt and the England man duly obliged.