Host/hostess mode is what it's called on here, out performing the curve when strangers are present, by strangers it could be anyone not there 24/7 be it a carer, family member or whoever from the outside world of us two. K
Definitely happens all the time with my OH - witty and follows conversations when others are around. He has mobility problems and even walks better and faster than he ever does at home when a physio or doctor asks to see how he walks.