Lake Eerie. Note: This joke has probably been made before.
D'EAU!
Water you doing
Soak it in petrol and put a match to it. (This is a joke, not and instruction, Reddit)
OC High humor
Bee flat Music joke for those who don't understand. B flat is a note.
Omega!! Note: surely it already exists but I thought of it independently and am proud of my terrible joke!