Clint
Losing your family

Tony
Your dad dying in the lab

Steve
Hulk

Thor
Darcy on sugar

Phil
Ward and Hydra

Bruce
Your dad staying Hulk and not being able to change back to normal

Petrio
Your dad running too fast

Bucky
Hydra taking your dad back

Loki
Odin

Starlord
All the Gurdians of the Galaxy dying