It'd be so easy to just cast this charm on a sauna-hot room, whilst keeping yourself cool with potions or magical plants then drag your friends into it with you and proceed to pretend that they have lost their minds because afterall you'd all be sweating if it were truly that hot. For added effect, one could even opt to wear an ugly holiday jumper. Cutty had it all figured out.

The infinity symbol he proceeded to draw in the air with his wand grew slightly and he was able to draw more than four of them whilst he spoke the incantation again on a nearby and lower wallspace. "Caelum Saepio!"