1. When your parent discovers the world of online dating.
2. When your parent manages to get more dates than you do.
3. When either of you mentions going on a third date with anyone, and you both have to pretend that nothing important happened.
4. When your parent starts acting like the two of you are bachelor friends.
5. When your parent dates people who are at all close in age to you.
6. When they think it would be fun to "try speed dating together."
No thanks, speed dating can do bad all by itself.