Seen a UFO?
Wear your seatbelt! Makes it harder for the aliens to suck you out of your car!
How about a ghost? (Or spirit or haint, etc)
I dont see anything but if you want to play Where"s Waldo?
Seen something that put you on edge?
Part of me says, "hey, if it doesnt bother the deer." And part of me says, "Deer get eaten!"
Ok, now you wanna know what happened to the deer! Nothing. The deer is fine.
Seen something mythical?
Bonus - have you heard something being all something?