And as they led him away, they seized one Simon of Cyrene, who was coming in from the country, and laid on him the cross, to carry it behind Jesus. (Luke 23:26)
And they compelled a passerby, Simon of Cyrene, who was coming in from the country, the father of Alexander and Rufus, to carry his cross. (Mark 15:21)
Simon of Cyrene's involvement int he crucifixion seems fairly random. A chance encounter, he just happened to be in the wrong place at the wrong time and got dragged into it. Or maybe it was the right pace at the right time? Mark's account includes the detail that Simon was the Father of Alexander and Rufus - presumably including this detail because Alexander and Rufus were known to, and likely members of, the early church when Mark is writing. Did this random incident lead to Simon and his two boys becoming Christians?
Most testimonies include a few seemingly random interactions or events that when viewed with hindsight seem anything but random. Pray that God would use you in those "random" interactions that he uses to draw people to himself.