clouds-3
Explanation
This comic takes the classic romantic scenario of cloud-watching and gives it a literal twist.
In the first panel, a couple is lying on a blanket outdoors. One asks: "Do you see anything in the clouds?" The other responds: "That one looks to me like a spinning propeller, and at the far end there's a lady with a dog, this dog looking back over the end."
In the next panel, the clouds literally spell out "SHEILA WILL YOU MARRY ME?" in skywriting.
The joke works on two levels. First, the cloud-watching game -- where people imaginatively see shapes in random cloud formations -- is subverted because what appeared to be a whimsical description of cloud shapes turns out to be a literal description of an actual skywriting marriage proposal. The person was not playing the imaginative game at all; they were just accurately describing what was in the sky.
Second, there is the irony that the romantic cloud-watching moment between the couple on the blanket is interrupted (or overshadowed) by someone else's even grander romantic gesture happening above them. The comic plays with the contrast between the small, intimate moment on the ground and the enormous public spectacle in the sky, and with the awkwardness of witnessing someone else's proposal while on your own date.