I saw the Messenger of Allah ﷺ raising his hands (high enough) in supplication (for rain) that the whiteness of his armpits became visible. (Using translation from Muslim 895a)
«كَانَ رَسُولُ اللهِ ﷺ يَرْفَعُ يَدَيْهِ فِي الدُّعَاءِ حَتَّى تُرَى إِبْطَاهُ»