Strong and Silent Type
My father went to the hospital with chest pains, and they decided to do an angiogram. The process injects dye into his valves to look for clots.
During his procedure, the surgeon asks if he suffers from blackouts, and a few more doctors get called in to have a look. My dad is the strong silent type but admits to minimal daily pain.
They take him to another type of X-ray machine and again are looking in bemusement without explaining anything. Turns out there was a blood clot the size of a golf ball floating free in his heart.
It normally should have taken out someone quickly and the doctors were all intrigued. He had a triple bypass 30 years ago and is still the strong and silent type. Story credit: Reddit / monkeypowah