For many footballers, having to warm the bench can be a real pain in the backside.
But someone has to do it, and some players have done it more than others. A lot more.
With his late cameo for Liverpool against Fulham on Sunday, James Milner made his 124th appearance as a Premier League substitute - putting him fifth in the all-time list.
Can you name the full top 10? You've got three minutes to have a go.
Can you name the players with most Premier League appearances as a substitute?