Having a Little Fun
Wearing a t-shirt can effectively shield your chest and back from the harmful rays of the sun, providing protection. However, when it comes to safeguarding your arms, it proves to be less effective. Thus, it appears that the sunburn was likely caused by the t-shirt itself.
In reality, the responsibility probably lies more with the inadequate use of sunscreen or the absence of it, although the presence of short sleeves certainly didn't assist. Nonetheless, it's noteworthy that this individual managed to find some amusement in their newly acquired sunburn lines.