The ability to extend the knee elbow or wrist joint past a straight line is

Actually, it is called  hypermobility syndrome.  It  is a condition that features joints that easily move beyond the normal range expected for that particular joint. Hypermobile joints tend to be inherited. Symptoms of the joint hypermobility syndrome include pain in the knees, fingers, hips, and elbows.

nope, but i have cleaned my brush in my cup of not as potentially harmful but nevertheless, very upsetting for scottish/british folks. especially if you've used the last teabag for it

explanation:

there could be something in that . . i am indeed an old scottish man!

there's a bit of bolshie-ness with it too though. i won't let go of the old ways . . tea and whisky . . whether the young whippersnappers like it or not!