Breaking a tire bead with a scissor jack is possible, but it's not the most efficient or safe method. A tire bead breaker is a tool specifically designed for this purpose and is much more effective. However, if you're in a situation where you don't have a bead breaker and need to remove a tire from its rim using a scissor jack, you can try the following method:

Warning: This method can be challenging, and there is a risk of damaging the tire, rim, or injuring yourself. Exercise caution and use appropriate safety gear.