Best uses for mundane spells

[Taejang]

In our last game session, my players jumped from a dragon and used Feather Fall to hit the ground behind enemy lines. In other words, Fly + Feather Fall = paratrooper.

What great uses for simple spells have happened at your table?

[Megasaber4000]

fire spells to heat water

[Jay R]

In a sailing ship battle in 2E, two wizards coordinated attacks. She cast Gust of Wind, aimed at the enemy's sails. Then I cast Lightning Bolt right above the water line.

The wind tilts the ship away from us, so the lightning strikes a spot on the hull that, a moment later, will be below the waterline.

[Fable Wright]

In D&D 5e, Detect Poison and Disease whenever entering the shady part of town. Know the exact number and locations of poisoned knives on a person, discern their character by means of their veneral diseases, hip flasks, and level of intoxication, and it also tells you what's edible on the menu. Just generally handy all around.

Gust of wind + sack of fine flour = tactical flamethrower. Except given that flour is cheap and everyone in the party can pitch in for an extra strength conflagration.

Call Lightning + Supercapacitors + Big battery = mad scientist laboratory time.